Perhaps you should try some spelling variations:
hanh mang » nhanh mang, hanh trang, nhanh lang
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
cua dang » cua cong, cua ban
cong van » cong vang, cong san, song van
than cau » toan cau, phan cau, than cap
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 - ((anh tang) or (hanh mang)) cua dang cong van ((than cau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - ((anh tang) OR (hanh mang)) cua dang cong van ((than cau) OR (phan cac)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((anh tang) or (hanh mang)) cua dang cong van ((than cau) or (phan cac))*.