Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh va, hanh tai, hanh van
cau luc » cau truc, cau phuc
sach ky » sac ky, sach ty, sach kem
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) OR (sach y)) nang xa hoi. hieu van cau luc va ((hanh vai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sach y)) nang xa hoi. hieu van cau luc va ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sach y)) nang xa hoi. hieu van cau luc va ((hanh vai) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) OR (sach y)) nang xa hoi. hieu van cau luc va ((hanh vai) or (hanh vi)) cua tre*.