Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
hoc thanh » hoc nhanh, hoan thanh, hoc phan
sach hoc » cach hoc, sach hoi, mach hoc
thuoc ma » hoc ma, duoc ma
te sach » toc sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi ban » hoi dan, hoi bai, doi ban
phap va » phap vat, pham van, phap day
pham va » pham van, pham ma, pham tai
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: te sach hoc tap, nghien cuu mon hoc thanh cong thuoc ma hoi ban ((phap va) or (pham va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoc tap, nghien cuu mon hoc thanh cong thuoc ma hoi ban ((phap va) OR (pham va)).
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu mon hoc thanh cong thuoc ma hoi ban ((phap va) or (pham va))*.