Perhaps you should try some spelling variations:
ban thanh » ban hang
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham dua » chay dua, cham giua, pham duc
ban hanh » ban hang
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang

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 y nang ma hoa. hieu van cham dua ((ban thanh) or (ban hanh)) lai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoa. hieu van cham dua ((ban thanh) OR (ban hanh)) lai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoa. hieu van cham dua ((ban thanh) or (ban hanh)) lai ((cua tre) or (cua triet))*.