Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nghien huu » nghien cuu, nguyen huu, nhiem huu
doanh khoa » toan khoa
sach thoi » cach thoi, sach hoi, sach tham
hoc doanh » hoa doanh, hoc danh, hoc dan
thoi tap » toi tap, hoc tap, thoi dai
khoa hoc » hoa hoc
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hai van » thai van, hai tan, hao van
hoc xa » hoc ma
ha van » hoa van, nha van, va van

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 thoi tap, nghien huu mot hoc doanh khoa hoc xa ((hai van) OR (ha van)) luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach thoi tap, nghien huu mot hoc doanh khoa hoc xa ((hai van) OR (ha van)) luan van".
• Adding a wildcard symbol may retrieve word variants: thuoc sach thoi tap, nghien huu mot hoc doanh khoa hoc xa ((hai van) OR (ha van)) luan van*.