Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh khoa » nganh hoa, nganh khong, doanh khoa
coc nganh » hoc nganh, cac nganh, chuc nganh
van phong » van dong, hai phong
phong dau » phong dieu, hang dau, phan dau
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
cong coc » cong cuoc, cong cac, cong co
khoa hoc » hoa hoc
cao thai » cao tai, cao thi, ca thai
thai van » thi van, thanh van, thai vung

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach hoc) OR (sach hoi)) tap, nghien thu cong coc nganh khoa hoc cao thai van phong dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach hoc) OR (sach hoi)) tap, nghien thu cong coc nganh khoa hoc cao thai van phong dau".
• Adding a wildcard symbol may retrieve word variants: so ((sach hoc) OR (sach hoi)) tap, nghien thu cong coc nganh khoa hoc cao thai van phong dau*.