Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
tranh va » tranh van, trang va, thanh va
trinh va » trinh van, trinh vat, trinh ve
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » 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 thieu xanh - hanh ((tranh va) or (trinh va)) nhung cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((tranh va) OR (trinh va)) nhung cong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((tranh va) or (trinh va)) nhung cong tap toan cau*.