Perhaps you should try some spelling variations:
trinh xuan » trinh quan, trinh luan, trinh xay
thong cong » trong cong, tong cong, thong thong
lieu tinh » trieu tinh, diep tinh, bien tinh
cong tan » cong tac, cong san, cong thanh
toan cao » toan ban
toan tap » toan ban
co lieu » cot lieu, co hieu, so lieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co lieu tinh - hanh ((trinh xuan) OR (trinh luat)) thong cong tan ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co lieu tinh - hanh ((trinh xuan) OR (trinh luat)) thong cong tan ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "co lieu tinh - hanh ((trinh xuan) OR (trinh luat)) thong cong tan ((toan cao) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: co lieu tinh - hanh ((trinh xuan) OR (trinh luat)) thong cong tan ((toan cao) or (toan tap))*.