Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
goc khuan » goc khuat, coc khoan, goc kham
khoa hoc » hoa hoc
phan van » pham van, thanh van, luan van
hoc hoi » hoc khoi, hoc noi, hoc moi
hoc hoa » hoc khoa
va phan » van phan, va phat, va phap
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((hoc hoi) OR (hoc hoa)) tap, nghien cua mot goc khuan khoa hoc ma hoi va phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((hoc hoi) OR (hoc hoa)) tap, nghien cua mot goc khuan khoa hoc ma hoi va phan van".
• Adding a wildcard symbol may retrieve word variants: tu ((hoc hoi) OR (hoc hoa)) tap, nghien cua mot goc khuan khoa hoc ma hoi va phan van*.