Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
lang van » dang van, tang van, hoang van
dang xay » dang van, van xay
so sanh » do sanh
lai cua » dai cua, hai cua, lai chau
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
sanh ky » hanh ky, sang ky, nganh ky
lang xa » lang ha
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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 ky ((((lang xa) or (lang van))) or (dang xay)) hoi. hieu ve cac duc van hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky ((((lang xa) OR (lang van))) OR (dang xay)) hoi. hieu ve cac duc van hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sanh ky ((((lang xa) or (lang van))) or (dang xay)) hoi. hieu ve cac duc van hanh lai cua tre*.