Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
von doanh » van doanh, voi doanh, toan doanh
doanh hoa » doanh khoa, doanh hoan, danh hoa
sach hoc » cach hoc, sach hoi, mach hoc
phan van » pham van, thanh van, luan van
cuu mot » cua mot, cuu mo, huu mot
mot von » mot con, mot cong, mot dong
va phan » van phan, va phat, va phap
hoa va » hoa van, hoa xa, hoa vo

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 hoc) or (cach thoi)) tap, nghien cuu mot von doanh hoa hoc ma hoa va phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach hoc) OR (cach thoi)) tap, nghien cuu mot von doanh hoa hoc ma hoa va phan van.
• Adding a wildcard symbol may retrieve word variants: su ((sach hoc) or (cach thoi)) tap, nghien cuu mot von doanh hoa hoc ma hoa va phan van*.