Perhaps you should try some spelling variations:
hanh thanh » nhanh thanh, thanh thanh, khanh thanh
doanh khoa » toan khoa
quoc doanh » quoc danh, quoc khanh, quoc toan
thanh van » thanh san, thanh toan, thanh phan
tong quoc » trong quoc, dong quoc, truong quoc
cuu tong » cuu cong, cuu tinh, huu tung
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
khoa hoc » hoa hoc
thi hanh » thi thanh
hoc xa » hoc ma
xa thi » xa thai, ha thi, ta thi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach hoc) or (sach hoi)) tap, nghien cuu tong quoc doanh khoa hoc xa thi hanh thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach hoc) OR (sach hoi)) tap, nghien cuu tong quoc doanh khoa hoc xa thi hanh thanh van.
• Adding a wildcard symbol may retrieve word variants: thu ((sach hoc) or (sach hoi)) tap, nghien cuu tong quoc doanh khoa hoc xa thi hanh thanh van*.