Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hieu ve » hieu van
va hanh » van hanh, va thanh, va danh
hanh ca » hanh cac, hanh cat, hanh cua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
ca cua » co 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 y) OR (sinh ly)) nang xa hoi. ((hieu va) or (hieu ve)) cam xuc va hanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sinh y) OR (sinh ly)) nang xa hoi. ((hieu va) OR (hieu ve)) cam xuc va hanh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sinh y) OR (sinh ly)) nang xa hoi. ((hieu va) or (hieu ve)) cam xuc va hanh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc ((sinh y) OR (sinh ly)) nang xa hoi. ((hieu va) or (hieu ve)) cam xuc va hanh ca cua tre*.