Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van pham » san pham, van phan, van phat
pham cuc » pham chuc, pham duc, pham cua
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
cua tre » cuu tre, cua triet, dua tren
cuc ban » cua ban, cac ban, cuu ban
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
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: tu ((sach ky) or (sac ky)) nang ma hoa. hieu van pham cuc ban thanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang ma hoa. hieu van pham cuc ban thanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang ma hoa. hieu van pham cuc ban thanh vi ((cua tre) or (cua te))*.