Perhaps you should try some spelling variations:
manh thai » manh hai, anh thai, manh khai
thu sach » tu sach, thuat sach, thuoc sach
thai cua » than cua, tai cuc, tri cua
sach tay » xach tay, sach hay, sach nay
va manh » van manh, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
lang xa » dang xay, lang van
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
ve cai » va cai, ve cac, ve tai

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tay ((lang xa) OR (lang ha)) hoi. hieu ((ve cai) OR (va cam)) luc va manh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tay ((lang xa) OR (lang ha)) hoi. hieu ((ve cai) or (va cam)) luc va manh thai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach tay ((lang xa) OR (lang ha)) hoi. hieu ((ve cai) or (va cam)) luc va manh thai cua tre*.