Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
manh hoi » manh hai, manh ho, manh hon
hoi cua » hoi chuc
va manh » van manh, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
va cam » va cham, va cac, va cao
ve tac » va tac, ve cac, ve tai

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 tay lang xa hoi. hieu ((((ve tac) or (te tai))) or (va cam)) duc va manh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tay lang xa hoi. hieu ((((ve tac) OR (te tai))) OR (va cam)) duc va manh hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach tay lang xa hoi. hieu ((((ve tac) or (te tai))) or (va cam)) duc va manh hoi cua tre*.