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

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - canh ((tinh va) or (((trinh van) OR (trinh toan)))) nhung cong tac phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh ((tinh va) OR (((trinh van) OR (trinh toan)))) nhung cong tac phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh ((tinh va) or (((trinh van) OR (trinh toan)))) nhung cong tac phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh ((tinh va) or (((trinh van) OR (trinh toan)))) nhung cong tac phan dau*.