Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tay lang » tai lang, tay quang, tham lang
manh hai » lanh hai, minh hai, thanh hai
tay tang » tay trung, tay quang, tay tieng
va cham » va chat, va tham
hai cua » thai cua, dai cua, hoi cua
va manh » van manh, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
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.

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