Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
cua dung » cua dang, cua dong, qua dung
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quang) or (hieu qua)) - hanh trung cua dung ((cong manh) OR (cong danh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (hieu qua)) - hanh trung cua dung ((cong manh) OR (cong danh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) or (hieu qua)) - hanh trung cua dung ((cong manh) OR (cong danh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (hieu qua)) - hanh trung cua dung ((cong manh) OR (cong danh)) toan ban*.