Perhaps you should try some spelling variations:
danh sai » dung sai, danh bat, danh dau
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
sai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 ve) OR (hieu va)) cam ((xuc va) or (tuc va)) danh sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) OR (tuc va)) danh sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) or (tuc va)) danh sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam ((xuc va) or (tuc va)) danh sai cua tre*.