Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
thuat sach » thuat lanh, thuat san
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thuat » hoc thuyet, hoc thuc, hoc chat
dong cong » duong cong, dang cong, cong cong
dung cong » dung trong
thanh van » thanh san, thanh toan, thanh phan
van cau » van dau, van hau, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuat sach - canh trinh chuan ((dong cong) or (dung cong)) thanh van cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuat sach - canh trinh chuan ((dong cong) OR (dung cong)) thanh van cau.
• Adding a wildcard symbol may retrieve word variants: hoc thuat sach - canh trinh chuan ((dong cong) or (dung cong)) thanh van cau*.