Perhaps you should try some spelling variations:
luat duoc » luat tuc
toc sach » hoc sach, doc sach, thuoc sach
van luat » dan luat, va luat, van xuat
hieu van » hieu va, thien van, lieu va
ma hang » mat hang, mua hang, va hang
duoc ma » duoc lam
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu lang
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ((ty lang) or (ty hang)) xa hoi. hieu van luat duoc ma hang va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ty lang) OR (ty hang)) xa hoi. hieu van luat duoc ma hang va cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((ty lang) or (ty hang)) xa hoi. hieu van luat duoc ma hang va cua te*".