Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cuc tre » duc tre, cuu tre, cuc thue
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
dang va » dang van, dang vat, hang va
ky dang » ky nang, ky danh
va hoi » xa hoi, va hoc, va hoa

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 dang va hoi. ((hieu ve) or (hieu va)) cham duc va thanh tai ((cuc tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang va hoi. ((hieu ve) OR (hieu va)) cham duc va thanh tai ((cuc tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang va hoi. ((hieu ve) or (hieu va)) cham duc va thanh tai ((cuc tre) or (cua tre))*.