Perhaps you should try some spelling variations:
coc nganh » hoc nganh, cac nganh, chuc nganh
thong hoa » thong khoa, thong ha, thong hoc
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
vu sach » vu bach, su sach, vu khach
hai van » thai van, ha van, hai tan
xa hai » xa thai, xua hai, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach hoc tap, nghien cuu cong coc nganh ((dung thuoc) or (thong hoa)) xa hai van nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach hoc tap, nghien cuu cong coc nganh ((dung thuoc) OR (thong hoa)) xa hai van nhan dan.
• Adding a wildcard symbol may retrieve word variants: vu sach hoc tap, nghien cuu cong coc nganh ((dung thuoc) or (thong hoa)) xa hai van nhan dan*.