Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham hoc » cham soc, chat hoc, cham hoi
ban hang » ngan hang
cong cua » cong cu, dong cua, huong cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hoc ban » hoc bang, hoc dan, hoc bai
va cua » va chua, via cua, ca cua

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 ky nang dai hoc. hieu van cham hoc ban hang ((va cua) or (cong cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang dai hoc. hieu van cham hoc ban hang ((va cua) OR (cong cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang dai hoc. hieu van cham hoc ban hang ((va cua) or (cong cua)) tre*.