Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
lieu tinh » trieu tinh, diep tinh, bien tinh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan hang » luan nang, luan han, luan hung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap
ho lieu » so lieu, co lieu, ho kieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho lieu tinh - hanh tang luan hang ((((cong dan) or (cong san))) or (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho lieu tinh - hanh tang luan hang ((((cong dan) OR (cong san))) OR (cong thanh)) toan cao.
• Adding a wildcard symbol may retrieve word variants: ho lieu tinh - hanh tang luan hang ((((cong dan) or (cong san))) or (cong thanh)) toan cao*.