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
hoi chau » hoi chu, hoi cham, hai chau
phan van » pham van, thanh van, tran van
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
goc dan » hoc dan, soc dan, ngoc dang
hoc xa » hoc ma
luan » quan, lan

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