Perhaps you should try some spelling variations:
vanh tai » van tai, hanh tai, anh tai
vanh tri » van tri, thanh tri, dinh tri
tu sach » thu sach, te sach, tu cach
qua dao » lua dao, qua da, cua dao
dao xuc » dao duc, dao tuc, dao xu
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
xuc va » duc va, tuc va, luc va
cua te » cua tu

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) or (su sach)) ky tang xa hoi. hieu qua dao xuc va ((vanh tri) OR (vanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky tang xa hoi. hieu qua dao xuc va ((vanh tri) OR (vanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky tang xa hoi. hieu qua dao xuc va ((vanh tri) OR (vanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky tang xa hoi. hieu qua dao xuc va ((vanh tri) OR (vanh tai)) cua te*.