Perhaps you should try some spelling variations:
kien nguoi » dien nguoi, gian nguoi, den nguoi
nguoi sach » nguoi san, nuoc sach
thieu hoa » tieu hoa, theu hoa, thien hoat
sach khoa » bach khoa, sach nha, anh khoa
khoa than » khoa luan, hoa thai, hoa tan
than cung » phan cung, thay cung, tham cung
hieu hoa » tieu hoa, dieu hoa, hiep hoa
cung may » dung may, cong may, cung hay
tu sach » thu sach, su sach, te sach
tinh » trinh, dinh, minh

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) or (hieu hoa)) chuyen đe ky thuat: kien nguoi sach khoa than cung may tinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thieu hoa) OR (hieu hoa)) chuyen đe ky thuat: kien nguoi sach khoa than cung may tinh.
• Adding a wildcard symbol may retrieve word variants: tu sach ((thieu hoa) or (hieu hoa)) chuyen đe ky thuat: kien nguoi sach khoa than cung may tinh*.