Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, mach hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
cau phan » chau phan, cuu phan, cac phan
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
hoi cau » hoi chu, hoc cau, hoa cau
mo hoc » mon hoc
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: tu sach hoc tap, nghien cuu ((mo hoc) or (co hoc)) dan khoa hoc xa hoi cau phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu ((mo hoc) OR (co hoc)) dan khoa hoc xa hoi cau phan van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu ((mo hoc) or (co hoc)) dan khoa hoc xa hoi cau phan van*.