Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cac toc » cac toi, cac nuoc, cac thoi
cuu tre » cau tren, cau treo
cac tuc » cac tu, cac tac, cac nuoc
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang

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

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