Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
tren khoa » trien khoa, tran khoa, tien khoan
hut tinh » hut binh, huu tinh, huy tinh
tinh hoc » sinh hoc, tin hoc, hinh hoc
cong hoc » dong hoc, cong hoa, cong coc
hoc tren » moc tren, hoc truyen, thuoc tren
khoa hoc » hoa hoc
va pham » van pham, va phat, va phan
va phap » va phat, ban phap
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: hut tinh hoc tap, nghien thu cong hoc tren khoa hoc xa hoi ((va pham) OR (va phap)) va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hut tinh hoc tap, nghien thu cong hoc tren khoa hoc xa hoi ((va pham) OR (va phap)) va".
• Adding a wildcard symbol may retrieve word variants: hut tinh hoc tap, nghien thu cong hoc tren khoa hoc xa hoi ((va pham) OR (va phap)) va*.