Perhaps you should try some spelling variations:
hoc nhanh » hoc phan
van thanh » ban thanh, van tuan
sach hoc » cach hoc, sach hoi, mach hoc
nong hoc » dong hoc, nang hoc, nong thon
thanh va » thanh van, hanh va, thanh ha
su sach » so sach, vu sach
hoi van » hoi va, hoi dan, hai van
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach hoc tap, nghien cuu mo ((hoc nganh) or (hoc nhanh)) nong hoc ma hoi van thanh va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoc tap, nghien cuu mo ((hoc nganh) OR (hoc nhanh)) nong hoc ma hoi van thanh va.
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu mo ((hoc nganh) or (hoc nhanh)) nong hoc ma hoi van thanh va*.