Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
cua tre » cuu tre, cua triet, dua tren
so sac » so sach, so dac
sac ky » cac ky, sai 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: so sac ky lang xa hoi. ((hieu van) or (hieu va)) bac xuc van hanh thai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky lang xa hoi. ((hieu van) OR (hieu va)) bac xuc van hanh thai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky lang xa hoi. ((hieu van) or (hieu va)) bac xuc van hanh thai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: so sac ky lang xa hoi. ((hieu van) or (hieu va)) bac xuc van hanh thai ((cua tre) OR (cua te))*.