Perhaps you should try some spelling variations:
thuong luong » cong luong, thong thuong
theo luong » tien luong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
hanh tang » hanh trang, hanh mang, hanh tung
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh 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 tinh - ((hanh tang) or (anh tang)) luan ((thuong luong) or (theo luong)) dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - ((hanh tang) OR (anh tang)) luan ((thuong luong) OR (theo luong)) dan chan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - ((hanh tang) or (anh tang)) luan ((thuong luong) or (theo luong)) dan chan cau*.