Perhaps you should try some spelling variations:
qua than » qua thanh, qua phan, qua tan
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
than le » thanh le, tuan le, phan le
luu tre » cuu tre, luy tre
te cac » tu cac, ve cac, te cao
tru » truc

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky lang xa hoi. hieu qua than le ((ban hanh) or (van hanh)) vi ((luu tre) OR (luu tru))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky lang xa hoi. hieu qua than le ((ban hanh) OR (van hanh)) vi ((luu tre) OR (luu tru)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky lang xa hoi. hieu qua than le ((ban hanh) or (van hanh)) vi ((luu tre) OR (luu tru))".
• Adding a wildcard symbol may retrieve word variants: te cac ky lang xa hoi. hieu qua than le ((ban hanh) or (van hanh)) vi ((luu tre) OR (luu tru))*.