Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nghien huu » nghien cuu, nguyen huu, nhiem huu
danh khoa » doanh khoa, anh khoa, danh hoa
sach hoc » cach hoc, sach hoi, mach hoc
hoc danh » hoc dan, hoc anh, hoc hanh
khoa hoc » hoa hoc
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hai van » thai van, ha van, hao van
hai tan » hai 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: thuoc sach hoc tap, nghien huu mot hoc danh khoa hoc xa ((hai van) OR (hai tan)) luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach hoc tap, nghien huu mot hoc danh khoa hoc xa ((hai van) OR (hai tan)) luan van".
• Adding a wildcard symbol may retrieve word variants: thuoc sach hoc tap, nghien huu mot hoc danh khoa hoc xa ((hai van) OR (hai tan)) luan van*.