Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
thanh hang » thanh hoang, thanh thang, tranh hang
goc thanh » ngoc thanh, hoc thanh, doc thanh
sach hoc » cach hoc, sach hoi, mach hoc
hang hoa » hang khoa, thanh hoa, hang va
phan dan » phan dang, phan dau, nhan dan
gian dan » gian lang
te sach » toc sach

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 cua mot goc thanh hang hoa xa hoi va ((phan dan) or (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoc tap, nghien cua mot goc thanh hang hoa xa hoi va ((phan dan) OR (gian dan)).
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cua mot goc thanh hang hoa xa hoi va ((phan dan) or (gian dan))*.