Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
cong tuan » cong tan, cong luan, cong thanh
doc hieu » toc thieu, hoc thieu, hoc hien
tang cua » mang cua, tang luan, thong cua
hang cua » mang cua, hang ca, huong cua
phan cau » phan dau, phan cac, 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 ((tang cua) or (hang cua)) hang cong tuan ((phan cau) OR (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh ((tang cua) OR (hang cua)) hang cong tuan ((phan cau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - hanh ((tang cua) or (hang cua)) hang cong tuan ((phan cau) OR (phan tu))".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh ((tang cua) or (hang cua)) hang cong tuan ((phan cau) OR (phan tu))*.