Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
lang van » dang van, tang van, hoang van
thai tuc » thai thuc, thai thuy, thai hoc
van thai » van thoai, van tai, van hai
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
bo sach » co sach, hoc sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

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 (lang van))) or (nang ma)) hoi. hieu van thai tuc va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y ((((nang xa) OR (lang van))) OR (nang ma)) hoi. hieu van thai tuc va hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: bo sach y ((((nang xa) or (lang van))) or (nang ma)) hoi. hieu van thai tuc va hanh vai cuu tre*.