Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh hoa » thanh hoa, khanh hoa, danh hoa
tong luan » tang luan, dung luan, hang luan
sach hoc » cach hoc, sach hoi, mach hoc
cong hoa » dong hoa, dong hoc, hang hoa
anh khoa » doanh khoa, hang khoa
hoi tong » hoi trong, hoi thong, hoi dong
tu sach » thu sach, su sach, te sach
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 cua cong hoa ((anh khoa) or (nganh hoa)) hoc xa hoi tong luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cua cong hoa ((anh khoa) OR (nganh hoa)) hoc xa hoi tong luan van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cua cong hoa ((anh khoa) or (nganh hoa)) hoc xa hoi tong luan van*.