Perhaps you should try some spelling variations:
chiet tach » chieu sach
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
trang cua » tranh cua, tang cua, trung cua
mang cua » manh cua, dung cua, ban cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: ho ((chiet tach) or (chieu sang)) - hanh ((trang cua) or (mang cua)) nhung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (chieu sang)) - hanh ((trang cua) OR (mang cua)) nhung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (chieu sang)) - hanh ((trang cua) or (mang cua)) nhung cong tac toan cau*.