Perhaps you should try some spelling variations:
thanh tai » thanh toan, doanh tai, thanh san
thanh hai » thanh phan, thanh hoa, thanh san
qua cham » qua hai, qua cac, va cham
cham dua » chay dua, cham giua, pham duc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
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: su sach ky mang may hoi. hieu qua cham dua ban ((thanh tai) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky mang may hoi. hieu qua cham dua ban ((thanh tai) OR (thanh hai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky mang may hoi. hieu qua cham dua ban ((thanh tai) or (thanh hai)) cua tre*.