Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
mang xa » mang may, dang xay, mang cua
hanh di » hanh vi, hanh de, hang di
lang xa » lang ha, dang xay, lang van
tuc van » thuc van, truc van, tuc va
su cac » tu cac, su cao, su can
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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

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