Perhaps you should try some spelling variations:
thanh mat » thanh dat, thanh mau, thanh mot
su sach » so sach, vu sach
mat cua » ma cua, manh cua, mang cua
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
su xac » pu xac, su cac
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: ((su sach) or (su xac)) ky tang xa hoi. hieu ve cam ((duc ban) or (duc van)) thanh mat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (su xac)) ky tang xa hoi. hieu ve cam ((duc ban) OR (duc van)) thanh mat cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (su xac)) ky tang xa hoi. hieu ve cam ((duc ban) or (duc van)) thanh mat cua tre*.