Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
cam tuc » cam xuc, cam tu, nam thuc
xa hanh » xa thanh, xa khanh, va hanh
hanh va » hang va, hanh vi
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

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