Perhaps you should try some spelling variations:
vanh tri » van tri, vanh tai, thanh tri
hieu lua » hieu luat, hieu qua, hieu luc
tu sach » thu sach, te sach, tu cach
lua dao » luat dat, luat dan, luat dau
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu 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 (su sach)) ky lang xa hoi. hieu lua 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 (su sach)) ky lang xa hoi. hieu lua 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 (su sach)) ky lang xa hoi. hieu lua dao ((xuc va) OR (luc va)) vanh tri cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky lang xa hoi. hieu lua dao ((xuc va) OR (luc va)) vanh tri cua te*.