Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hieu sang » chieu sang, hieu lang, hieu quang
tranh cua » doanh cua
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » doanh cua, ban cua
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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 - canh ((tranh cua) or (manh cua)) phuong cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - canh ((tranh cua) OR (manh cua)) phuong cong dan than cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - canh ((tranh cua) or (manh cua)) phuong cong dan than cao*.