Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
sach hoc » cach hoc, sach hoi, mach hoc
cong hoa » dong hoa, hang hoa
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach
va luan » vay luan, van luan, va quan
hoc xa » hoc ma

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