Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » thien van, lieu va
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
va cuu » va cau, va chu, va huu

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

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