Perhaps you should try some spelling variations:
tien khong » tien phong, dien khong, tien chuong
tin khong » tinh khong, thinh khong, trinh khong
thuc bach » truc bach, thuc cach, thuoc sach
bach khoa » anh khoa
khoa phan » hoa phan, khoa than, khoa phau
phan cong » thanh cong
cong may » cong xay, cong ma, cong hay
may minh » may tinh, mai minh, van minh
tu sach » thu sach, su sach, te sach

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 ((tin khong) OR (tien khong)) chuyen đe ky thuat: kien thuc bach khoa phan cong may minh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tin khong) OR (tien khong)) chuyen đe ky thuat: kien thuc bach khoa phan cong may minh".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tin khong) OR (tien khong)) chuyen đe ky thuat: kien thuc bach khoa phan cong may minh*.