Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
canh trinh » canh tranh, hanh trinh, canh tinh
trinh quan » tinh quang, trinh luat, trinh han
hoc thuat » hoc thuyet, hoc thuc, hoc chat
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
thang ban » hang ban, tang ban, thanh ban
ban cau » bang cau, ban can, van cau

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 quan ((dong cong) or (dang cong)) thang ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuat sach - canh trinh quan ((dong cong) OR (dang cong)) thang ban cau.
• Adding a wildcard symbol may retrieve word variants: hoc thuat sach - canh trinh quan ((dong cong) or (dang cong)) thang ban cau*.