Perhaps you should try some spelling variations:
thanh vi » thanh va, thanh ve, nhanh vi
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
cau duc » cao duc, cau luc, chu duc
y xang » ty xang
va cau » van cau, va cac, va dau

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

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