Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
bo sach » co sach, hoc sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
nang xa » nang x, mang xa, ang xa
cac tu » cac thu, cach tu, cac du
va cua » va chua, via cua, ca 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 (lang xa))) or (nang ma)) hoi. hieu van cac tu va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y ((((nang xa) OR (lang xa))) OR (nang ma)) hoi. hieu van cac tu va hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: bo sach y ((((nang xa) or (lang xa))) or (nang ma)) hoi. hieu van cac tu va hanh va cua tre*.