Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
nam xuc » cam xuc, nam xua, nam thuc
va hanh » van hanh, va thanh, va danh
y sang » _ sang, duy sang
ma hoi » mai hoi, ma hoa, me hoi
xuc va » duc va, tuc va, luc va
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y sang ((ma hoi) OR (xa hoi)). hieu van nam xuc va hanh lai ((cua te) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y sang ((ma hoi) or (xa hoi)). hieu van nam xuc va hanh lai ((cua te) OR (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: su sach y sang ((ma hoi) or (xa hoi)). hieu van nam xuc va hanh lai ((cua te) OR (cua tu))*.