Perhaps you should try some spelling variations:
hoi doanh » hoa doanh, voi doanh, doi doanh
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
nhan tai » hang tai, van tai, toan tai
hoc anh » hoc nganh, hoc nhanh, ngoc anh
anh hoa » anh khoa, danh hoa, hanh hoa
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: thuat ((sach hoc) or (mach hoc)) tap, nghien cuu cong hoc anh hoa hoc xa hoi doanh nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach hoc) OR (mach hoc)) tap, nghien cuu cong hoc anh hoa hoc xa hoi doanh nhan tai.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach hoc) or (mach hoc)) tap, nghien cuu cong hoc anh hoa hoc xa hoi doanh nhan tai*.