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

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 xuc va ((thanh vi) or (hanh vi)) ((cu tren) OR (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y xang xa hoi. hieu va cau xuc va ((thanh vi) OR (hanh vi)) ((cu tren) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y xang xa hoi. hieu va cau xuc va ((thanh vi) or (hanh vi)) ((cu tren) OR (dua tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach y xang xa hoi. hieu va cau xuc va ((thanh vi) or (hanh vi)) ((cu tren) OR (dua tren))*.