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
da thai » dao thai, do thai, ca thai
hoc da » hoc dan, hoc dai, hoc dat

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 da thai tuan pham van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((mach hoc) OR (dich hoc)) tap, nghien cuu cong hoc khuan khoa hoc da 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 da thai tuan pham van*.