Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh dan » thanh san, thanh van, thanh dat
thu sach » thuat sach, thuoc sach, thu hoach
san khoa » toan khoa, hang khoa, da khoa
khoa hoc » hoa hoc
tu sach » su sach, te sach, tu cach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc san » hoc dan, toc san, hoc can
hoi van » hoi va, hoi dan, hai van
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) or (thu sach)) hoc tap, nghien cuu mon hoc san khoa hoc xa hoi van thanh dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) hoc tap, nghien cuu mon hoc san khoa hoc xa hoi van thanh dan.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) hoc tap, nghien cuu mon hoc san khoa hoc xa hoi van thanh dan*.