Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu vien » hieu hien, hieu viec, lieu vien
vien cac » vien bach, vien dai, vien da
van hanh » ban hanh, van anh, van ban
cac luc » cau luc, coc luc, cac nuoc
sach ty » sach tu, sach thu, xach tay
cao hoc » co hoc, cho hoc, chat hoc
cua cau » cua cac, cua chu, cua cay
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 ty) or (sach y)) nang cao hoc. hieu vien cac luc ((van hanh) OR (van thanh)) vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang cao hoc. hieu vien cac luc ((van hanh) OR (van thanh)) vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) nang cao hoc. hieu vien cac luc ((van hanh) OR (van thanh)) vi cua cau*".