Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
hanh dao » lanh dao, thanh dat, thanh dam
tu sach » thu sach, su sach, te sach
cam cuu » cham cuu, cap cuu
cuu ban » cuu van, cua ban, cuu san
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma

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