Perhaps you should try some spelling variations:
hieu sang » chieu sang, hieu lang, hieu quang
doc hieu » toc thieu, hoc thieu, hoc hien
hinh cua » chinh cua, sinh cua, tinh cua
chinh ca » chinh ta, chinh va, chinh tai
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
can cau » van cau, ban cau, ca cau

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 sang - hanh ((hinh cua) or (chinh ca)) nhung ((cong dan) or (cong san)) can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - hanh ((hinh cua) OR (chinh ca)) nhung ((cong dan) OR (cong san)) can cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - hanh ((hinh cua) or (chinh ca)) nhung ((cong dan) or (cong san)) can cau*.