Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hieu va » lieu va, hieu qua
cac loc » cac lop, cac toc, cac hoc
cua tre » cuu tre, cua triet, dua tren
lang xa » lang ha, dang xay, lang van
loc va » hoc va, luc va
can ky » van ky, ban ky, tan ky
dan ky » van ky
cua te » cua tu

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

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