Perhaps you should try some spelling variations:
luat tuc » luat thue
mai hoi » mai khoi, dai hoi, lai hoi
va luat » va thuat, vay luan, cua luat
va hang » van hang, va nang, va lang
su sach » so sach, vu sach
ma hoi » xa hoi, ma hoa, me hoi
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
da su » dan su, dat su, va su
ki su » ky su

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 nang ((ma hoi) OR (mai hoi)). lieu va luat tuc va hang ((da su) OR (ki su)) triet~.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((ma hoi) or (mai hoi)). lieu va luat tuc va hang ((da su) or (ki su)) triet*.