Perhaps you should try some spelling variations:
san khoa » toan khoa, hang khoa, da khoa
khoa hoc » hoa hoc
phap vat » phap luat, phap phat, phap viet
tu sinh » thu sinh, tuc sinh, tu minh
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
hoc san » hoc dan, toc san, hoc can
pham va » pham van, pham ma, pham tai
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 sinh hoc tap, nghien cuu mot hoc san khoa hoc xa hoi va ((pham va) or (phap vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sinh hoc tap, nghien cuu mot hoc san khoa hoc xa hoi va ((pham va) OR (phap vat)).
• Adding a wildcard symbol may retrieve word variants: tu sinh hoc tap, nghien cuu mot hoc san khoa hoc xa hoi va ((pham va) or (phap vat))*.