Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
xang mai » lang mai, sang mai, hoang mai
cau tren » cu tren, dau tren, ca tren
mai hoi » mai khoi, dai hoi, lai hoi
te sach » toc sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
loc va » hoc va
luc va » duc va, tuc va
vi cau » va cau, ve cau, di cau

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 (te sach)) ty xang mai hoi. hieu ve cham ((loc va) or (luc va)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ty xang mai hoi. hieu ve cham ((loc va) OR (luc va)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ty xang mai hoi. hieu ve cham ((loc va) or (luc va)) hanh vi cau tren*.