Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hang tai » hang va, dung tai
tai cua » thai cua, tai cuc, tri cua
va hang » van hang, va nang, va lang
cham lo » cham o, cham soc, cham hoi
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
cam lo » nam lo, cam ly, cam o

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) or (tu sach)) 6 tang xa hoi. hieu ve ((cham lo) or (cam lo)) va hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) 6 tang xa hoi. hieu ve ((cham lo) OR (cam lo)) va hang tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) 6 tang xa hoi. hieu ve ((cham lo) or (cam lo)) va hang tai cua tre*.