Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong coc, cong ho
cong hoa » dong hoa, dong hoc, hang hoa
cau luan » cu luan, dau luan, lau luan
tu sach » thu sach, su sach, te sach
huu mon » huu son, hau mon, huu mot
mon hoc » toan hoc, dong hoc
hoi cau » hoi chu, hoc cau, hoa cau

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 hoc tap, nghien huu mon hoc nganh ((cong hoc) OR (cong hoa)) xa hoi cau luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien huu mon hoc nganh ((cong hoc) OR (cong hoa)) xa hoi cau luan van".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien huu mon hoc nganh ((cong hoc) OR (cong hoa)) xa hoi cau luan van*.