Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh chat
theo chieu » theo tieu, ho chieu, theo chu
chieu tinh » trieu tinh, lieu tinh, chau tinh
trinh thuc » trinh tu, trinh thi
hong bang » dong bang, hang ban, hong hanh
nhung cau » chung cu, nhung bai, nhu cau
cong ban » cong bang, cong san, cong tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu tinh - hanh ((trinh thuat) OR (trinh thuc)) nhung ((cong ban) or (hong bang)) nhung cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu tinh - hanh ((trinh thuat) OR (trinh thuc)) nhung ((cong ban) OR (hong bang)) nhung cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu tinh - hanh ((trinh thuat) OR (trinh thuc)) nhung ((cong ban) or (hong bang)) nhung cau".
• Adding a wildcard symbol may retrieve word variants: theo chieu tinh - hanh ((trinh thuat) OR (trinh thuc)) nhung ((cong ban) or (hong bang)) nhung cau*.