Perhaps you should try some spelling variations:
nguyen duy » nguyen duc, nguyen huu, nguyen ly
nganh khoa » nganh hoa, nganh khong, doanh khoa
goc nganh » hoc nganh, hoc nhanh, cac nganh
van thanh » ban thanh, van tuan
thanh dan » thanh san, thanh van, thanh dat
sach hoi » sach doi, cach thoi, hoach hoi
sach moi » sach doi, bach mai, sach bai
khoa hoc » hoa hoc
duy mot » duy dot, huy mot, dung mot
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) or (sach moi)) tai, nguyen duy mot goc nganh khoa hoc xa hoi van thanh dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach hoi) OR (sach moi)) tai, nguyen duy mot goc nganh khoa hoc xa hoi van thanh dan.
• Adding a wildcard symbol may retrieve word variants: su ((sach hoi) or (sach moi)) tai, nguyen duy mot goc nganh khoa hoc xa hoi van thanh dan*.