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
khoa hoc » hoa hoc
van luan » van quan, van tuan, von luan
thoi tap » toi tap, hoc tap, thoi dai
mon hoc » toan hoc, dong hoc
mot hoc » mo hoc, mot goc, bot hoc
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 thoi tap, nghien huu ((mot hoc) OR (mon hoc)) doanh khoa hoc xa hai van luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach thoi tap, nghien huu ((mot hoc) OR (mon hoc)) doanh khoa hoc xa hai van luan van".
• Adding a wildcard symbol may retrieve word variants: thuoc sach thoi tap, nghien huu ((mot hoc) OR (mon hoc)) doanh khoa hoc xa hai van luan van*.