Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
hang dai » hoang dai, hang tai, hang dau
qua cay » cua cay, qua cac, qua ca
cay cua » ca cua, day cua, cay ca
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((ma hoi) or (ma hoa)). hieu qua cay cua ban hang dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((ma hoi) OR (ma hoa)). hieu qua cay cua ban hang dai cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((ma hoi) or (ma hoa)). hieu qua cay cua ban hang dai cua te*.