Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh dai » thanh hai, thanh dat, thanh oai
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
ve cam » ve cham, ve cac, va cam

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