Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
tu sach » thu sach, su sach, te sach
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
soc van » hoc van, oc van, sac van
cuu tre » cua tre, cau tren

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

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