Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
cang thang » cong thanh, dang thanh
chua dong » cua dong, huy dong, hoa dong
thang ban » hang ban, tang ban, thanh ban
ha dong » hoat dong, van dong
ban can » ban dan, ban hang, ban hanh

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 lanh)) - canh tranh ((chua dong) or (ha dong)) cang thang ban can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuat sach) OR (thuat lanh)) - canh tranh ((chua dong) OR (ha dong)) cang thang ban can.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thuat sach) OR (thuat lanh)) - canh tranh ((chua dong) or (ha dong)) cang thang ban can".
• Adding a wildcard symbol may retrieve word variants: hoc ((thuat sach) OR (thuat lanh)) - canh tranh ((chua dong) or (ha dong)) cang thang ban can*.