Perhaps you should try some spelling variations:
luat nganh » luat ngan, thuat nganh, luat doanh
nganh cong » nhanh chong, thanh cong
dong luat » dong luan, dung luat, dong luc
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
phan van » pham van, thanh van, luan van
te sach » toc sach
va phan » van phan, va phat, va phap
do xa » doi xa, o xa, do a
do va » do van, so va

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoc tap, nghien cuu dong luat nganh cong ((do xa) OR (do va)) hoi va phan van~".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu dong luat nganh cong ((do xa) OR (do va)) hoi va phan van*.