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

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 ((cong thuoc) OR (cong thuc)) 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 ((cong thuoc) OR (cong thuc)) mai hoi va nhan van".
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghiep va dong hoc nganh ((cong thuoc) OR (cong thuc)) mai hoi va nhan van*.