Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
nganh hoa » thanh hoa, khanh hoa, danh hoa
thoi tap » toi tap, hoc tap, thoi dai
cuu cong » cua cong, thu cong, cac cong
co nganh » hoc nganh, cac nganh, moi nganh
nhan dan » phan dau, gian dan
nhan tai » hang tai, van tai, toan tai
su cach » su sach, tu cach, su cac
cong co » dong co, cong cu, cong so
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
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: su cach thoi tap, nghien cuu cong co nganh hoa hoc xa hai van ((nhan dan) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach thoi tap, nghien cuu cong co nganh hoa hoc xa hai van ((nhan dan) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: su cach thoi tap, nghien cuu cong co nganh hoa hoc xa hai van ((nhan dan) or (nhan tai))*.