Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh doi » thanh loi, thanh moi, thanh do
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
cua tre » cua te, cuu tre, dua tren
xuc va » tuc va, luc va, xac va

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 va tham ((xuc va) or (duc va)) thanh doi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va tham ((xuc va) OR (duc va)) thanh doi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu va tham ((xuc va) or (duc va)) thanh doi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va tham ((xuc va) or (duc va)) thanh doi ((cua tre) OR (cua triet))*.