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, 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 chuan ((dong cong) OR (dang cong)) thang ban cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thuat sach - canh trinh chuan ((dong cong) OR (dang cong)) thang ban cau".
• Adding a wildcard symbol may retrieve word variants: hoc thuat sach - canh trinh chuan ((dong cong) OR (dang cong)) thang ban cau*.