Perhaps you should try some spelling variations:
ban hanh » ban hang
cay phoi » cap phoi, tay hoi, cay cho
tu sach » thu sach, su sach, te sach
cu tren » dua tren
cac ban » cac dan, cac van, can ban
cam cac » ca cac, nam cac, cam chan
hieu ve » hieu va, hieu van
sach uu » sach luu, sach tu, sach xu
xay hoi » xa hoi, tay hoi, gay thoi
uu dang » huu dang, su dang, vu dang
tu tren » tu truyen, tu tieng, tu trong
ve cam » ve cham, ve cac, va cam

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 uu dang ((xay hoi) or (cay phoi)). hieu ve cam cac ban hanh vi ((cu tren) OR (tu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach uu dang ((xay hoi) OR (cay phoi)). hieu ve cam cac ban hanh vi ((cu tren) OR (tu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach uu dang ((xay hoi) or (cay phoi)). hieu ve cam cac ban hanh vi ((cu tren) OR (tu tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach uu dang ((xay hoi) or (cay phoi)). hieu ve cam cac ban hanh vi ((cu tren) OR (tu tren))*.