Perhaps you should try some spelling variations:
hanh vii » hanh voi, hanh va, hanh noi
sach hoi » sach doi, sach moi, cach thoi
tu sach » thu sach, su sach, te sach
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
luc va » duc va, tuc va, loc va
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoi ((nang xa) or (nang x)) hoi. hieu ve cau luc va ((hanh vii) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi ((nang xa) OR (nang x)) hoi. hieu ve cau luc va ((hanh vii) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi ((nang xa) or (nang x)) hoi. hieu ve cau luc va ((hanh vii) or (hanh vi)) cua tre*.