Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
phan cong » thanh cong
sach hoi » sach doi, sach moi, cach thoi
hoc phan » hoc dan, hoc pho
thuoc ma » hoc ma, duoc ma
phap van » pham van, phan van, phap han
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
cuu hoa » cuu hoan, cau hoa, cuu hoc
va phap » va phat, ban phap
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, nghien ((cuu hoa) or (cuu khoa)) hoc phan cong thuoc ma hoi va phap van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien ((cuu hoa) OR (cuu khoa)) hoc phan cong thuoc ma hoi va phap van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien ((cuu hoa) or (cuu khoa)) hoc phan cong thuoc ma hoi va phap van*.