Perhaps you should try some spelling variations:
nghien thieu » nghiep hieu, nghiep tieu, nguyen thien
nganh khoa » nganh hoa, nganh khong, doanh khoa
thieu mot » hieu mot, thieu so, hieu moi
hoc nganh » hoc nhanh
khoa hoc » hoa hoc
van hang » van khang, van hoang, van thang
hang tai » hang va, dung tai
su sach » so sach, vu sach
hoi tap » hoc tap, hoi tai, hai tap
mot hoc » mon hoc, mo hoc, mot goc
hoi van » hoi va, hoi dan, hai van
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) or (hoi dap)), nghien thieu mot 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) OR (hoi dap)), nghien thieu mot hoc nganh khoa hoc xa hoi van hang tai.
• Adding a wildcard symbol may retrieve word variants: su sach ((hoi tap) or (hoi dap)), nghien thieu mot hoc nganh khoa hoc xa hoi van hang tai*.