Perhaps you should try some spelling variations:
goc thanh » ngoc thanh, hoc thanh, doc thanh
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
nhan dan » gian dan, nhan tai
phan dau » phan tu, hang dau
te sach » toc sach
cuu mot » cua mot, cuu mo, huu mot
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: te sach hoc tap, nghien cuu mot goc thanh cong hoc xa hoi va ((nhan dan) OR (phan dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoc tap, nghien cuu mot goc thanh cong hoc xa hoi va ((nhan dan) OR (phan dau))".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu mot goc thanh cong hoc xa hoi va ((nhan dan) OR (phan dau))*.