Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sinh ky » sinh ly, sinh y, kinh ky
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
di cua » doi cua, de cua, do 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 ky lang xa hoi. ((hieu ve) or (hieu van)) cam xuc va dan ((di cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh ky lang xa hoi. ((hieu ve) OR (hieu van)) cam xuc va dan ((di cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh ky lang xa hoi. ((hieu ve) or (hieu van)) cam xuc va dan ((di cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: hoc sinh ky lang xa hoi. ((hieu ve) or (hieu van)) cam xuc va dan ((di cua) OR (dai cua)) tre*.