Perhaps you should try some spelling variations:
luan phan » luan van, luan hoan
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
so doanh » so danh, hoa doanh, cho doanh
su doanh » cua doanh, san doanh, muc doanh
khoa hoc » hoa hoc
thai van » thi van, thanh van, thai vung
van luan » van quan, van tuan, von luan
tu sach » thu sach, su sach, te sach
xa thai » ca thai, a thai, da thai
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: tu sach hoc tap, nghien cuu cong ((so doanh) OR (su doanh)) khoa hoc xa thai van luan phan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu cong ((so doanh) OR (su doanh)) khoa hoc xa thai van luan phan".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu cong ((so doanh) OR (su doanh)) khoa hoc xa thai van luan phan*.