Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
kien thuoc » kien thuc, bien thuoc, trien thuoc
sach theu » sach thieu, sach thu, sach tham
hoa huyen » hoi huyen, hoa truyen, hong huyen
sach khoa » bach khoa, sach nha, anh khoa
khoa phan » hoa phan, khoa than, khoa phau
theu hoa » tieu hoa, tien hoa, thi hoa
cung may » dung may, cung hay, mang may
cong may » cong xay, cong ma, cong hay
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 theu hoa huyen đe ky thuat: kien thuoc sach khoa phan ((cung may) OR (cong may)) dinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach theu hoa huyen đe ky thuat: kien thuoc sach khoa phan ((cung may) OR (cong may)) dinh".
• Adding a wildcard symbol may retrieve word variants: tu sach theu hoa huyen đe ky thuat: kien thuoc sach khoa phan ((cung may) OR (cong may)) dinh*.