Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
kien thuoc » kien thuc, bien thuoc, trien thuoc
thuoc danh » thuoc dang, thuoc thanh, thuc dan
sanh tren » sach tren, lanh tren, doanh tren
sinh tren » dinh tren, tinh tren, sinh trung
danh hoa » thanh hoa, khanh hoa, nganh hoa
tan cong » tan cuong, tran cong, toan cong
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 danh hoa tan cong ha dinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sanh tren) OR (sinh tren)) hoc chuyen đe ky thuat: kien thuoc danh 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 danh hoa tan cong ha dinh*.