Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, chien huu
tran khoa » toan khoa, san khoa, nhan khoa
hoc tran » hoc tan, hoc tren, boc tran
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
mot hoc » mon hoc, mo hoc, mot goc
va nhan » van nhan, ca nhan, va phan
hoc xa » hoc ma
sinh » dinh, minh, kinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh hoc tap, ((nghien huu) OR (nhiem huu)) mot hoc tran khoa hoc xa hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh hoc tap, ((nghien huu) OR (nhiem huu)) mot hoc tran khoa hoc xa hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: hoc sinh hoc tap, ((nghien huu) OR (nhiem huu)) mot hoc tran khoa hoc xa hoi va nhan dan*.