Perhaps you should try some spelling variations:
thanh sang » thanh san, thanh hang, thanh hoang
sang cua » mang cua, song cua, hang cua
duc ban » duc tan, duc van, duc man
dua ban » dia ban, cua ban, qua ban
va giao » van giao, va giai, va gia
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sach y)) nang x hoi. hieu va giao ((duc ban) or (dua ban)) thanh sang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang x hoi. hieu va giao ((duc ban) OR (dua ban)) thanh sang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach y)) nang x hoi. hieu va giao ((duc ban) or (dua ban)) thanh sang cua tre*".