Perhaps you should try some spelling variations:
thanh sang » thanh san, thanh hang, thanh hoang
toc sach » hoc sach, doc sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
sang cua » mang cua, song cua, hang cua
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
dua ban » cua ban, qua ban, mua ban
cua tre » cua te, cuu tre, cua triet
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: toc sach ty nang mai hoi. hieu ve cam ((dua ban) or (dia ban)) thanh sang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang mai hoi. hieu ve cam ((dua ban) OR (dia ban)) thanh sang cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang mai hoi. hieu ve cam ((dua ban) or (dia ban)) thanh sang cua tre*.