Perhaps you should try some spelling variations:
nghien thieu » nghiep hieu, nghiep tieu, nguyen thien
nganh khoa » nganh hoa, nganh khong, doanh khoa
hang tai » hang va, dung tai
van hang » van khang, van hoang, van thang
khoa hoc » hoa hoc
sach hoi » sach doi, sach moi, cach thoi
hoi van » hoi va, hoi dan, hai van
su sach » so sach, vu sach
mon hoc » toan hoc, dong hoc
bot hoc » post hoc, bot khoa, buoc hoc
hoi tap » hoi dap, hoc tap, hoi tai
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: su sach hoi tap, nghien thieu ((bot hoc) or (mon hoc)) nganh khoa hoc xa hoi van hang tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoi tap, nghien thieu ((bot hoc) OR (mon hoc)) nganh khoa hoc xa hoi van hang tai.
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien thieu ((bot hoc) or (mon hoc)) nganh khoa hoc xa hoi van hang tai*.