Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
cang thang » cong thanh, dang thanh
hoc thuat » hoc thuc, hoc chat, hoc thiet
dong cang » dong bang, dong cong, dong cung
thang ban » hang ban, tang ban, thanh ban
tranh ha » thanh ha, trang ha, trinh ha
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) or (hoc thuyet)) sach - canh tranh ha dong cang thang ban can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thuat) OR (hoc thuyet)) sach - canh tranh ha dong cang thang ban can.
• Adding a wildcard symbol may retrieve word variants: ((hoc thuat) or (hoc thuyet)) sach - canh tranh ha dong cang thang ban can*.