Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
chu phan » chau phan, cho phan, chu han
phan van » pham van, thanh van, luan van
mo hoc » mon hoc, co hoc
hoc xa » hoc ma
ho chu » hoi chu, cho chu, ho chua
xa ho » xa hoi, xa hoa, xa hoc

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) OR (mach hoc)) tap, nghien cuu mo hoc dan khoa hoc xa ho chu phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach hoc) OR (mach hoc)) tap, nghien cuu mo hoc dan khoa hoc xa ho chu phan van".
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) OR (mach hoc)) tap, nghien cuu mo hoc dan khoa hoc xa ho chu phan van*.