Perhaps you should try some spelling variations:
toc tinh » toc kinh, loc tinh, doc tinh
tinh hoc » sinh hoc, tin hoc, hinh hoc
khoa hoc » hoa hoc
nhan tai » hang tai, van tai, toan tai
cuu mot » cua mot, cuu mo, huu mot
hoc san » hoc dan, hoc can, hoc sau
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc tinh hoc tap, nghien cuu mot ((hoc san) OR (toc san)) khoa hoc xa hoi ca nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc tinh hoc tap, nghien cuu mot ((hoc san) OR (toc san)) khoa hoc xa hoi ca nhan tai".
• Adding a wildcard symbol may retrieve word variants: toc tinh hoc tap, nghien cuu mot ((hoc san) OR (toc san)) khoa hoc xa hoi ca nhan tai*.