Perhaps you should try some spelling variations:
thanh vi » thanh va, thanh ve, nhanh vi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » hieu qua
cao suc » cao su, cao duc
cua tre » cua te, cuu tre, cua triet
suc va » duc va, tuc va, luc 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 nang ma hoa. ((hieu va) or (lieu va)) cao suc va ((thanh vi) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoa. ((hieu va) OR (lieu va)) cao suc va ((thanh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoa. ((hieu va) or (lieu va)) cao suc va ((thanh vi) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoa. ((hieu va) or (lieu va)) cao suc va ((thanh vi) OR (hanh vi)) cua tre*.