Perhaps you should try some spelling variations:
kien thuoc » kien thuc, bien thuoc, trien thuoc
hoc chuyen » khong chuyen
sanh tren » sach tren, lanh tren, sinh tren
thuoc anh » thuoc thanh, thuoc dang, thuoc sach
khoa than » khoa luan, hoa thai, hoa tan
tren hoc » truyen hoc, trung hoc, triet hoc
anh khoa » doanh khoa, hang khoa
cong may » cong xay, cong ma, cong my
cong hay » cong ha, cong xay, cong hai
so sanh » do sanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh tren hoc chuyen đe ky thuat: kien thuoc anh khoa than ((cong may) OR (cong hay)) dinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh tren hoc chuyen đe ky thuat: kien thuoc anh khoa than ((cong may) OR (cong hay)) dinh".
• Adding a wildcard symbol may retrieve word variants: so sanh tren hoc chuyen đe ky thuat: kien thuoc anh khoa than ((cong may) OR (cong hay)) dinh*.