Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
ve triet » va trien, su triet
cua viet » ca viet, hoa viet, cua vat
dang xa » dang xay, lang xa, dang ha
sach ky » sac ky, sach y, sach ty
tu tuan » thu tuan, tu luan, ta tuan
anh vai » anh va, anh bai, anh van
ky dang » ky nang, ky danh
tu sach » thu sach, su sach, te sach
da tu » dau tu, dan tu, dai tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang xa hoi. ((hieu vien) OR (hieu hien)) da tu tuan anh vai ((ve triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. ((hieu vien) OR (hieu hien)) da tu tuan anh vai ((ve triet) OR (cua viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. ((hieu vien) OR (hieu hien)) da tu tuan anh vai ((ve triet) or (cua viet))*".