Perhaps you should try some spelling variations:
dang xay » dang van
hieu van » hieu va, thien van, lieu va
sinh ty » sinh ly, sinh y, sinh tu
hieu ve » hieu va
cua tre » cua te, cuu tre, cua triet
xuc ca » xuc cam, xuc cua
dao da » dao dan, dao do, dao va
da cua » dai cua, day cua, dan cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh ty ((dang xay) OR (van xay)) hoi. ((hieu ve) or (hieu van)) cam xuc ca dao da cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh ty ((dang xay) OR (van xay)) hoi. ((hieu ve) OR (hieu van)) cam xuc ca dao da cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh ty ((dang xay) OR (van xay)) hoi. ((hieu ve) or (hieu van)) cam xuc ca dao da cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sinh ty ((dang xay) OR (van xay)) hoi. ((hieu ve) or (hieu van)) cam xuc ca dao da cua tre*.