Perhaps you should try some spelling variations:
nhanh vi » nhanh va, nhanh thi, hanh va
tu sach » thu sach, te sach, tu cach
cau tuc » cau truc, cau tu, cau luc
hieu va » lieu va, hieu qua
ca tren » cau tren, cu tren, la tren
xang xa » lang xa, mang xa, ang xa
su sach » so sach, vu sach
y xang » ty xang
tuc va » thuc va, truc va, tuc xa
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) or (su sach)) y xang xa hoi. hieu va cau tuc va ((nhanh vi) or (hanh vi)) ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y xang xa hoi. hieu va cau tuc va ((nhanh vi) OR (hanh vi)) ca tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y xang xa hoi. hieu va cau tuc va ((nhanh vi) or (hanh vi)) ca tren*.