Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
thuc day » thuc vat
tu sach » thu sach, te sach, tu cach
danh vu » danh tu, anh vu, danh du
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
su sach » so sach, vu sach
vu cua » hu cua, tu cua
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty hang xa hoi. hieu ve phan ((thuc day) OR (thuc dan)) danh vu cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ty hang xa hoi. hieu ve phan ((thuc day) OR (thuc dan)) danh vu cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty hang xa hoi. hieu ve phan ((thuc day) OR (thuc dan)) danh vu cua te*.