Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cham so » cham soc, cham o, ham so
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
so ban » sao ban, so bang, co ban
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang x hoi. hieu van cham so ban thanh ((vai cua) or (lai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu van cham so ban thanh ((vai cua) OR (lai cua)) te.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu van cham so ban thanh ((vai cua) or (lai cua)) te*.