Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
han tai » hang tai, nhan tai, van tai
cuu tre » cau tren, cau treo
cau luc » cau truc, cau phuc
van cau » van dau, van hau, van chat
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
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: thuoc sach ty nang xa hoi. hieu van cau luc va ((han tai) or (hanh vi)) ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty nang xa hoi. hieu van cau luc va ((han tai) OR (hanh vi)) ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ty nang xa hoi. hieu van cau luc va ((han tai) or (hanh vi)) ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty nang xa hoi. hieu van cau luc va ((han tai) or (hanh vi)) ((cua tre) OR (cuu tre))*.