Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep vua, nghe cua
nghiep cua » nghiep vua, nghiep luan, nghien cuu
doanh khoa » toan khoa
cach thoi » cac thoi, cach thuc, cach noi
cac doanh » cac dan, cac dang, van doanh
ban khanh » ban hanh, ban thanh, van khanh
khanh van » thanh van, khanh vinh, hanh va
thoi tap » toi tap, hoc tap, thoi dai
cong cac » cuong cac, cong tac, cong cau
khoa hoc » hoa hoc
ve cach » va cach, ve cac, ve canh
hoa ban » hoa dan, hoa van, hoa han

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

• Performing a fuzzy search may retrieve terms with similar spellings: ve cach thoi tap, ((nghien cua) or (nghiep cua)) cong cac doanh khoa hoc ma hoa ban khanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ve cach thoi tap, ((nghien cua) OR (nghiep cua)) cong cac doanh khoa hoc ma hoa ban khanh van.
• Adding a wildcard symbol may retrieve word variants: ve cach thoi tap, ((nghien cua) or (nghiep cua)) cong cac doanh khoa hoc ma hoa ban khanh van*.