Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thuc, trinh chat
trinh thiet » trinh viet, trinh thi
chieu tinh » trieu tinh, lieu tinh, chau tinh
phung cong » nhung cong, phong cong, nhung chong
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
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: ho chieu tinh - hanh ((trinh thuat) or (trinh thiet)) phung cong dan ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - hanh ((trinh thuat) OR (trinh thiet)) phung cong dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu tinh - hanh ((trinh thuat) or (trinh thiet)) phung cong dan ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - hanh ((trinh thuat) or (trinh thiet)) phung cong dan ((toan cao) OR (toan ban))*.