Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, lieu vien, thieu nien
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
cua cau » cua cac, cua chu, cua cay
sach tu » sach thu, cach tu, sach ty
cho hoc » khoa hoc
tu hang » thu hang, tu hanh, tu hung
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu hang ((cho hoc) OR (co hoc)). ((hieu vien) or (hieu viec)) cac luc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu hang ((cho hoc) OR (co hoc)). ((hieu vien) OR (hieu viec)) cac luc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu hang ((cho hoc) OR (co hoc)). ((hieu vien) or (hieu viec)) cac luc van hanh vi cua cau*".