Perhaps you should try some spelling variations:
thuat tach » thuat sach, thuat tac, thuat thanh
thuat mach » thuat sach, thuyet mach, thuat lanh
tranh chua » tranh cua, trinh chuan, tranh chap
chua dong » cua dong, ha dong, huy dong
dong bang » dong san
bang hang » ban hang, hang hang, nang hang
hang ban » hang luan, hang va, hang tai
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 tach) OR (thuat mach)) - canh tranh chua dong bang hang ban can~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thuat tach) OR (thuat mach)) - canh tranh chua dong bang hang ban can".
• Adding a wildcard symbol may retrieve word variants: hoc ((thuat tach) OR (thuat mach)) - canh tranh chua dong bang hang ban can*.