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 kem, sach hay
sach ty » sach tu, sach thu, xach tay
cao hoi » cau hoi, co hoi, cao hoc
van hac » van hoc, van ha, van hai
hac dat » hoc dat, tac dat, hoach dat
vai cua » dai cua, hai cua, lai cua

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) OR (sach y)))) nang cao 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) OR (sach y)))) nang cao hoi. hieu van hac dat va thanh vai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (((sach ty) OR (sach y)))) nang cao hoi. hieu van hac dat va thanh vai cua vat".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (((sach ty) OR (sach y)))) nang cao hoi. hieu van hac dat va thanh vai cua vat*.