Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
tong cong » trong cong, cong cong, dung cong
chu xanh » chu manh, chieu xanh, chua xang
tranh va » tranh van, trang va, trinh va
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap
cho chu » cho thue

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho chu xanh - canh ((tranh va) or (trinh vat)) tong cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho chu xanh - canh ((tranh va) OR (trinh vat)) tong cong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: cho chu xanh - canh ((tranh va) or (trinh vat)) tong cong tap toan cau*.