Perhaps you should try some spelling variations:
trinh thuat » trinh thiet, trinh thuc, trinh chat
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
tran chau » tranh chap, tran huu
cong tan » cong tac, cong san, cong thanh

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 xanh) or (chieu tinh)) - hanh ((trinh thuat) OR (trinh luat)) nhung cong tan tran chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu tinh)) - hanh ((trinh thuat) OR (trinh luat)) nhung cong tan tran chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (chieu tinh)) - hanh ((trinh thuat) OR (trinh luat)) nhung cong tan tran chau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (chieu tinh)) - hanh ((trinh thuat) OR (trinh luat)) nhung cong tan tran chau*.