Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
tinh cua » trinh cua, tinh chat, tranh cua
sinh cua » manh cua, dinh cuu, sinh va
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - hanh ((tinh cua) or (sinh cua)) nhung cong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ((tinh cua) OR (sinh cua)) nhung cong tan phan cau.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh ((tinh cua) or (sinh cua)) nhung cong tan phan cau*.