Perhaps you should try some spelling variations:
sang ky » sang kyo, dang ky, tang ky
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
cac loc » cac lop, cac toc, cac hoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
san ky » van ky, dan ky, ban ky
loc va » hoc va, luc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((san ky) OR (sang ky)) lang xa hoi. ((hieu va) or (lieu va)) cac loc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) lang xa hoi. ((hieu va) OR (lieu va)) cac loc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (sang ky)) lang xa hoi. ((hieu va) or (lieu va)) cac loc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (sang ky)) lang xa hoi. ((hieu va) or (lieu va)) cac loc va hanh vi cua tre*.