Perhaps you should try some spelling variations:
hoa doanh » toan doanh, hoa dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cua ngan » cua ban, vu ngan, cua dan
ngan dan » ngan danh, nhan dan, ngan han
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu tong
hoi cua » hoi chuc
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: tu sach hoc tap, nghien ((cuu mon) or (cuu cong)) hoa doanh hoa hoc xa hoi cua ngan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien ((cuu mon) OR (cuu cong)) hoa doanh hoa hoc xa hoi cua ngan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien ((cuu mon) or (cuu cong)) hoa doanh hoa hoc xa hoi cua ngan dan*.