Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh chat
trinh thuc » trinh tu, trinh thi
hien sach » dien sach, kien sach, thien hach
cong vang » cong quang, cong ngang, cong san
cong lang » cong luong, cong quang, cong ngang
hoang cap » hoang cao, hoang van, hang ca

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

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