Perhaps you should try some spelling variations:
sach doi » sach hoi, sach moi, sach dao
hoc danh » hoc dan, hoc anh, hoc nganh
hoc hanh » hoc nhanh, hoc thanh, hoc anh
khoa hoc » hoa hoc
hoi luan » hoa luan, hoc luan, khoa luan
te sach » toc sach
doi tac » dong tac
cuu mon » cuu mo, cuu mot, cuu cong
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
van van » van ban, tan van, san van

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach doi tac, nghien cuu mon ((hoc danh) or (hoc hanh)) khoa hoc mai hoi luan van van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach doi tac, nghien cuu mon ((hoc danh) OR (hoc hanh)) khoa hoc mai hoi luan van van.
• Adding a wildcard symbol may retrieve word variants: te sach doi tac, nghien cuu mon ((hoc danh) or (hoc hanh)) khoa hoc mai hoi luan van van*.