Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh quan
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh han » trinh quan
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan dau » phan tu, hang dau
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - canh ((tinh va) or (((trinh han) or (trinh toan)))) nhung cong tac phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh ((tinh va) OR (((trinh han) OR (trinh toan)))) nhung cong tac phan dau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh ((tinh va) or (((trinh han) or (trinh toan)))) nhung cong tac phan dau*.