Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
nghiep va » nghiep vu
thuoc mai » thuoc ma, thuoc tai, thuoc moi
hoc nhanh » hoc phan
nhan van » nhan dan, nhan va, phan van
sach hoi » sach doi, sach moi, cach thoi
va nhan » van nhan, ca nhan, va phan
mai hoi » mai khoi, dai hoi, lai hoi
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
va dong » van dong, ha dong, xa dong

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, nghiep va dong ((hoc nganh) OR (hoc nhanh)) cong thuoc mai hoi va nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoi tap, nghiep va dong ((hoc nganh) OR (hoc nhanh)) cong thuoc mai hoi va nhan van".
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghiep va dong ((hoc nganh) OR (hoc nhanh)) cong thuoc mai hoi va nhan van*.