Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoa doanh » toan doanh, hoa dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
thu cach » thuc cach, thu canh, tu cach
cach hoc » cach thuc, cach thoi, dich hoc
cong hoa » dong hoa, dong hoc, hang hoa
nhan van » nhan dan, nhan va, phan van
phan dau » phan tu, hang dau
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: thu cach hoc tap, nghien cua cong hoa doanh hoa hoc xa hoi va ((nhan van) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu cach hoc tap, nghien cua cong hoa doanh hoa hoc xa hoi va ((nhan van) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: thu cach hoc tap, nghien cua cong hoa doanh hoa hoc xa hoi va ((nhan van) or (phan dau))*.