Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
dang xay » dang van, van xay
cac thuc » cach thuc, cac thu, can thuc
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
lang xa » lang ha, lang van
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thuat toan)) ky ((dang xay) or (lang xa)) hoi. hieu ve cac thuc van hanh di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuat toan)) ky ((dang xay) OR (lang xa)) hoi. hieu ve cac thuc van hanh di cua tu.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuat toan)) ky ((dang xay) or (lang xa)) hoi. hieu ve cac thuc van hanh di cua tu*.