Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
tranh cua » doanh cua, manh cua
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan tu, phan lap
phan cac » nhan cach, phan dau, phan lap

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

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