Perhaps you should try some spelling variations:
khoanh khac » khoa khac
hoa chuyen » khoa chuyen, hoc chuyen, hoa huyen
khoan khao » hoan hao, khoa kham, khoa khac
sach tien » sach tren, sach thieu
tien hoa » dien hoa, trien hoat, tien va
thuc cac » thuc cach, tuc cac, phuc cac
dung may » dung va, dung tai, mang may
vu sach » vu bach, su sach, vu khach
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: vu sach tien hoa chuyen đe ky thuat: kien thuc cac ((khoan khao) OR (khoanh khac)) dung may tinh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tien hoa chuyen đe ky thuat: kien thuc cac ((khoan khao) OR (khoanh khac)) dung may tinh".
• Adding a wildcard symbol may retrieve word variants: vu sach tien hoa chuyen đe ky thuat: kien thuc cac ((khoan khao) OR (khoanh khac)) dung may tinh*.