Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
van luan » van quan, van tuan, von luan
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

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