Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
ty hang » ly hang, thi hang, thu hang
cao hoi » cau hoi, co hoi, cao hoc
qua cao » qua cac, qua ca, qua cai
cao luc » bao luc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc 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 ((ty hang) or (ty xang)) cao hoi. hieu qua cao luc va hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty hang) OR (ty xang)) cao hoi. hieu qua cao luc va hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty hang) or (ty xang)) cao hoi. hieu qua cao luc va hanh vi cau tren*.