Perhaps you should try some spelling variations:
tranh chua » tranh cua, trinh chuan, tranh chap
cang thang » dang thanh
cong thanh » dong thanh, cong trinh, cong tan
hoc thuat » hoc thuyet, hoc chat, hoc thiet
chua dong » cua dong, ha dong, huy dong
hoc thuc » hoc huu
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 thuc)) sach - canh tranh chua dong ((cang thang) OR (cong thanh)) ban can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thuat) OR (hoc thuc)) sach - canh tranh chua dong ((cang thang) OR (cong thanh)) ban can.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thuat) or (hoc thuc)) sach - canh tranh chua dong ((cang thang) OR (cong thanh)) ban can".
• Adding a wildcard symbol may retrieve word variants: ((hoc thuat) or (hoc thuc)) sach - canh tranh chua dong ((cang thang) OR (cong thanh)) ban can*.