Perhaps you should try some spelling variations:
hieu luat » hieu qua
luat phan » luan phan, luat phap, luat pha
phan duc » pham duc, phan tu, phan dau
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
duc van » duc va, duc tan, duc manh
vi su » ve su, ki su, oi su

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 ty xang xa hoi. hieu luat phan duc van hanh ((vi su) or (va su)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. hieu luat phan duc van hanh ((vi su) OR (va su)) viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang xa hoi. hieu luat phan duc van hanh ((vi su) or (va su)) viet*.