Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
van hac » van hoc, van ha, van hai
hac dat » hoc dat, tac dat, hoach dat
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sach ty)) nang ma hoi. hieu van hac dat va thanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang ma hoi. hieu van hac dat va thanh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach ty)) nang ma hoi. hieu van hac dat va thanh vai cua vat*.