Perhaps you should try some spelling variations:
luat phan » luan phan, luat phap, luat pha
hieu luat » hieu qua
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
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
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 nang 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 nang 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 nang xa hoi. hieu luat phan duc van hanh ((vi su) or (va su)) viet*.