Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
khong cang » thong cong, hong bang, khong dung
hieu lang » chieu sang, nhieu tang, hieu van
hanh manh » hanh mang, lanh manh, hoang manh
cua khong » hua khong, cua phuong, cua thuong
manh cua » doanh cua, ban cua
cang tac » cong tac, canh tac, sang tac
tac tran » tan tran, tac trai, tac tren
tran cao » toan cao, tran chau, trang cho

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 lang) OR (hieu quang)) - hanh manh cua khong cang tac tran cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - hanh manh cua khong cang tac tran cao".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - hanh manh cua khong cang tac tran cao*.