Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
kien thuoc » kien thuc, bien thuoc, trien thuoc
sanh tren » sach tren, lanh tren, doanh tren
sinh tren » dinh tren, tinh tren, sinh trung
thuoc anh » thuoc thanh, thuoc dang, thuoc sach
tan cong » tan cuong, tran cong, toan cong
anh hoa » anh khoa, danh hoa, hanh hoa
hoa tan » hoa dan, hoa van, hoa tin
cong ha » cong hoa, dong ha, cong tac
ha dinh » ha tinh, va dinh, ba dinh

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) OR (sinh tren)) hoc chuyen đe ky thuat: kien thuoc anh hoa tan cong ha dinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sanh tren) OR (sinh tren)) hoc chuyen đe ky thuat: kien thuoc anh hoa tan cong ha dinh".
• Adding a wildcard symbol may retrieve word variants: so ((sanh tren) OR (sinh tren)) hoc chuyen đe ky thuat: kien thuoc anh hoa tan cong ha dinh*.