Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh ve » hanh ve, thanh va, thanh vien
su sach » so sach, vu sach
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
xuc va » duc va, luc va, xac va
y xang » ty xang
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y xang xa hoi. hieu va cau ((xuc va) or (tuc va)) ((thanh ve) or (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y xang xa hoi. hieu va cau ((xuc va) OR (tuc va)) ((thanh ve) OR (hanh vi)) cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach y xang xa hoi. hieu va cau ((xuc va) or (tuc va)) ((thanh ve) or (hanh vi)) cau tren*.