Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
canh trinh » canh tranh, hanh trinh, canh tinh
thuat sach » thuat lanh
chuan dong » chua dong, chuan long, chuyen dong
cong thang » cong thanh, cang thang, cong thong
thuat san » thuat toan, thuat song, thuat lanh
dong cong » duong cong, dung cong, dang cong
thang van » tang van, thanh van, thong van
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) or (thuat san)) - canh trinh chuan dong cong thang van cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuat sach) OR (thuat san)) - canh trinh chuan dong cong thang van cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thuat sach) or (thuat san)) - canh trinh chuan dong cong thang van cau*.