Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
hieu van » hieu va, thien van, lieu va
tang cua » mang cua, tang luan, thong cua
hang cua » mang cua, hang ca, huong cua
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu van) or (hieu quang)) - hanh ((tang cua) or (hang cua)) nhung cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu van) OR (hieu quang)) - hanh ((tang cua) OR (hang cua)) nhung cong tac than cau.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu van) or (hieu quang)) - hanh ((tang cua) or (hang cua)) nhung cong tac than cau*.