Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang cao hoi. hieu ve chao xu ((van thanh) OR (ban hang)) dai cua tu~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang cao hoi. hieu ve chao xu ((van thanh) or (ban hang)) dai cua tu*.