Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vanh tai » hanh tai, anh tai, vanh dai
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
van tai » von tai, van tuan
va cam » va cham, va cac, va cao
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 cam ((xuc va) OR (duc va)) ((vanh tai) or (van tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va cam ((xuc va) OR (duc va)) ((vanh tai) OR (van tai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu va cam ((xuc va) OR (duc va)) ((vanh tai) or (van tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va cam ((xuc va) OR (duc va)) ((vanh tai) or (van tai)) cua triet*.