Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
nganh hoa » thanh hoa, khanh hoa, danh hoa
hoc nganh » hoc nhanh
nhan dan » phan dau, gian dan, nhan tai
thai van » thi van, thanh van, thai vung
hang tai » hang va, dung tai
sach doi » sach hoi, sach moi, sach dao
cong hoc » dong hoc, cong hoa, cong coc
cac cong » cua cong
xa thai » ca thai, a thai, da thai
doi tap » doi tac, doi dap, doi tai
su sach » so sach, vu sach
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 doi tap, nghien cac cong hoc nganh hoa hoc xa thai van ((nhan dan) or (hang tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach doi tap, nghien cac cong hoc nganh hoa hoc xa thai van ((nhan dan) OR (hang tai)).
• Adding a wildcard symbol may retrieve word variants: su sach doi tap, nghien cac cong hoc nganh hoa hoc xa thai van ((nhan dan) or (hang tai))*.