Perhaps you should try some spelling variations:
tieu tinh » trieu tinh, tieu trinh, lieu tinh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan hang » luan nang, luan han, luan hung
nong tac » dong tac, nong tan, tuong tac
cong tac » cong ty
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: theo tieu tinh - hanh tang luan hang ((nong tac) or (cong tac)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu tinh - hanh tang luan hang ((nong tac) OR (cong tac)) toan ban*.