Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang xa hoi. ((hieu va) OR (hieu qua)) cac ((xuc va) or (duc va)) hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. ((hieu va) OR (hieu qua)) cac ((xuc va) OR (duc va)) hanh tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. ((hieu va) OR (hieu qua)) cac ((xuc va) or (duc va)) hanh tai cuu tre*".