Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
nhung cong » dung cong, thong cong, hang cong
thang cua » thong cua, hang cua, than cua
tranh cua » doanh cua, manh cua
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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: nho ((hieu quang) OR (hieu qua)) - hanh ((thang cua) or (tranh cua)) nhung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu quang) OR (hieu qua)) - hanh ((thang cua) OR (tranh cua)) nhung cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu quang) OR (hieu qua)) - hanh ((thang cua) or (tranh cua)) nhung cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu quang) OR (hieu qua)) - hanh ((thang cua) or (tranh cua)) nhung cong tan toan cau*.