Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh va » tranh van, trinh va, thanh va
trang va » tran van, hang va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (chieu tinh)) - canh ((tranh va) or (trang va)) nhung cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu tinh)) - canh ((tranh va) OR (trang va)) nhung cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu tinh)) - canh ((tranh va) or (trang va)) nhung cong tac toan cao*.