Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
te sach » toc sach
hieu ve » hieu va
dang ma » dang mau, dang mam, dang mat
ky dang » ky nang, ky danh
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang ma hoi. ((hieu ve) or (hieu van)) cam xuc va thanh tai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ma hoi. ((hieu ve) OR (hieu van)) cam xuc va thanh tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ma hoi. ((hieu ve) or (hieu van)) cam xuc va thanh tai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ma hoi. ((hieu ve) or (hieu van)) cam xuc va thanh tai ((cua tre) OR (cuu tre))*.