Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh loi, thanh tai
thanh lap » thanh san, phan lap, thanh hai
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham dua » chay dua, cham giua, pham duc
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet

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 ky nang ma hoa. hieu van cham dua ban ((thanh lai) or (thanh lap)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ma hoa. hieu van cham dua ban ((thanh lai) OR (thanh lap)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ma hoa. hieu van cham dua ban ((thanh lai) or (thanh lap)) cua tre*.