Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
bo sach » co sach, hoc sach
sang ma » tang ma, sang tao, mang may
va hanh » van hanh, va thanh, va danh
hac tuc » thac toc, thai tuc
van hac » van hoc, van ha, van hai
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, nang cao, mang may
nang xa » nang x, lang xa, mang xa
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach y ((nang xa) or (((nang ma) or (sang ma)))) hoi. hieu van hac tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y ((nang xa) OR (((nang ma) OR (sang ma)))) hoi. hieu van hac tuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: bo sach y ((nang xa) or (((nang ma) or (sang ma)))) hoi. hieu van hac tuc va hanh vi cua tre*.