Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
chat xuc » chat huu, cam xuc, chao xu
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
xuc 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 ty ((nang ma) or (nang x)) hoi. ((hieu ve) OR (hieu va)) chat xuc va thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ma) OR (nang x)) hoi. ((hieu ve) OR (hieu va)) chat xuc va thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang ma) or (nang x)) hoi. ((hieu ve) OR (hieu va)) chat xuc va thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang ma) or (nang x)) hoi. ((hieu ve) OR (hieu va)) chat xuc va thanh tai cua tre*.