Perhaps you should try some spelling variations:
hoc thanh » hoc nhanh, hoan thanh, hoc phan
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
thanh ky » hanh ky, than ky, thanh tay
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
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: hoc thanh ky ((lang van) OR (dang van)) hoi. hieu ve cac duc ((van hanh) or (va thanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thanh ky ((lang van) OR (dang van)) hoi. hieu ve cac duc ((van hanh) OR (va thanh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thanh ky ((lang van) OR (dang van)) hoi. hieu ve cac duc ((van hanh) or (va thanh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc thanh ky ((lang van) OR (dang van)) hoi. hieu ve cac duc ((van hanh) or (va thanh)) hai cua tre*.