Perhaps you should try some spelling variations:
kien thuoc » kien thuc, bien thuoc, trien thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
thieu hoa » tieu hoa, hieu hoa, theu hoa
hoa huyen » hoi huyen, hoa truyen, hong huyen
khoa than » khoa luan, hoa thai, kho khan
cung may » dung may, cong may, cung hay
may dinh » may tinh, mai dinh, my dinh
tu sach » thu sach, su sach, te sach
hoa tan » hoa dan, hoa van, hoa tin

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 thieu hoa huyen đe ky thuat: kien thuoc sach ((khoa than) OR (hoa tan)) cung may dinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thieu hoa huyen đe ky thuat: kien thuoc sach ((khoa than) OR (hoa tan)) cung may dinh".
• Adding a wildcard symbol may retrieve word variants: tu sach thieu hoa huyen đe ky thuat: kien thuoc sach ((khoa than) OR (hoa tan)) cung may dinh*.