Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, va trien, ve triet
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
tuc gia » tac gia, duc gia, toc gia
gia anh » gia thanh, gia dinh, gia linh
cua tre » cua te, cuu tre, cua triet
cac tuc » cac toc, cac tu, cac tac
ve cac » va cac, vien cac
anh vi » hanh vi, anh va, anh ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang mai hoi. hieu ve cac tuc gia anh vi ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang mai hoi. hieu ve cac tuc gia anh vi ((cua tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang mai hoi. hieu ve cac tuc gia anh vi ((cua tre) or (va triet))*.