Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
nang xa » nang x, lang xa, nang ma
cau tuc » cau tu, cau luc, cau phuc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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