Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hac thuc » hoc thuc, ha thuc, thach thuc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tinh » may tinh
luu tre » luu tru, cuu tre, luy tre
va sac » va cac, va suc, va san
sac ky » cac ky, sai ky
va hac » van hac, va khac, va cac
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: va sac ky nang xa hoi. hieu va hac thuc ((ban thanh) OR (va tinh)) vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "va sac ky nang xa hoi. hieu va hac thuc ((ban thanh) OR (va tinh)) vi luu tre".
• Adding a wildcard symbol may retrieve word variants: va sac ky nang xa hoi. hieu va hac thuc ((ban thanh) OR (va tinh)) vi luu tre*.