Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
van cham » van chat, van tham, va cham
hanh di » hanh vi, hanh de, hang di
tu cach » tu cac
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
luc va » tuc va, loc va
di cua » dai cua, doi cua, de cua

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

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