Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
kien thuoc » kien thuc, bien thuoc, trien thuoc
sanh tren » sach tren, lanh tren, sinh tren
vai huyen » tai huyen, van chuyen, thai huyen
sach khoa » bach khoa, sach nha, anh khoa
khoa than » khoa luan, hoa thai, hoa tan
tren vai » trien van, trang vai, tien va
so sanh » do sanh
cung la » dung lam, cung cap
cong va » dong va, cong ha, cong tac

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 vai huyen đe ky thuat: kien thuoc sach khoa than ((cung la) or (cong va)) tinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh tren vai huyen đe ky thuat: kien thuoc sach khoa than ((cung la) OR (cong va)) tinh.
• Adding a wildcard symbol may retrieve word variants: so sanh tren vai huyen đe ky thuat: kien thuoc sach khoa than ((cung la) or (cong va)) tinh*.