Perhaps you should try some spelling variations:
vanh tri » van tri, vanh tai, thanh tri
tu sach » thu sach, su sach, te sach
qua dao » lua dao, qua da, cua dao
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
so sach » so sanh, bo sach, co sach
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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 (so sach)) ky tang xa hoi. hieu qua dao ((xuc va) OR (luc va)) vanh tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky tang xa hoi. hieu qua dao ((xuc va) OR (luc va)) vanh tri cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sach)) ky tang xa hoi. hieu qua dao ((xuc va) OR (luc va)) vanh tri cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky tang xa hoi. hieu qua dao ((xuc va) OR (luc va)) vanh tri cua te*.