Perhaps you should try some spelling variations:
luan hieu » luan tieu, luan dieu, luan thiet
pho gian » pho giao, thoi gian, cho giang
gian van » giang van, gian dan, gian lan
hieu cua » hieu qua, bieu cua, hieu ca
dan luan » doanh luan, dung luan, tang luan
khoe dan » khoe ban, khoa dang, khoe dinh
dieu cua » dieu tra
hieu tra » dieu tra, hiep tran, chieu tro
tien thu » tieu thu, kien thuc, trien thi
van tien » toan tien, van hieu, van tuan
tap cua » tap quan, tiep cua
cua tap » cua tam, cua phap
cap cua » cap cuu, cau cua, ap cua
cay cua » day cua, cay ca, cay lua
ca cua » co cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( pho gian van tien thu ) or ((((( pho cap cua tap cua ) or ( cho ((cay cua) OR (ca cua)) dieu cua ))) or ((( khoe dan luan hieu cua ) or ( khoe dan luan hieu tra ))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( pho gian van tien thu ) OR ((((( pho cap cua tap cua ) OR ( cho ((cay cua) OR (ca cua)) dieu cua ))) OR ((( khoe dan luan hieu cua ) OR ( khoe dan luan hieu tra ))))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( pho gian van tien thu ) or ((((( pho cap cua tap cua ) or ( cho ((cay cua) OR (ca cua)) dieu cua ))) or ((( khoe dan luan hieu cua ) or ( khoe dan luan hieu tra ))))))*".