Perhaps you should try some spelling variations:
hoc khuan » hoc phan, hoc khoa, hoc quan
thai tuan » khai tuan, thai luan, thai tran
tuan pham » thanh pham, san pham, tac pham
mach hoc » cach hoc, anh hoc, bac hoc
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
dao thai » dao thi, do thai, da thai
hoc dao » hoc dan, hoc cao, hoc dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((mach hoc) or (dich hoc)) tap, nghien cuu cong hoc khuan khoa hoc dao thai tuan pham van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (dich hoc)) tap, nghien cuu cong hoc khuan khoa hoc dao thai tuan pham van.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (dich hoc)) tap, nghien cuu cong hoc khuan khoa hoc dao thai tuan pham van*.