Perhaps you should try some spelling variations:
thanh tap » thanh lap, thanh tai, thanh tam
thanh tay » thanh tai, thanh toan, thanh thuy
tu sach » thu sach, su sach, te sach
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
luc va » duc va, tuc va, loc 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 sang xa hoi. ((hieu ve) or (hieu va)) cam luc va ((thanh tap) OR (thanh tay)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang xa hoi. ((hieu ve) OR (hieu va)) cam luc va ((thanh tap) OR (thanh tay)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang xa hoi. ((hieu ve) or (hieu va)) cam luc va ((thanh tap) OR (thanh tay)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang xa hoi. ((hieu ve) or (hieu va)) cam luc va ((thanh tap) OR (thanh tay)) cua tre*.