Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
hoc thanh » hoc nhanh, hoan thanh, hoc phan
thuoc ma » hoc ma, duoc ma
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoi tai, hai tap
va phan » van phan, va phat, va phap
mo hoc » mon hoc, co hoc
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: tu sach ((hoi tap) or (hoc tap)), nghien cuu mo hoc thanh cong thuoc ma hoi va phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((hoi tap) OR (hoc tap)), nghien cuu mo hoc thanh cong thuoc ma hoi va phan van.
• Adding a wildcard symbol may retrieve word variants: tu sach ((hoi tap) or (hoc tap)), nghien cuu mo hoc thanh cong thuoc ma hoi va phan van*.