Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, le thanh
hieu va » lieu va, hieu qua
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
cao tu » cao thu, co tu, cao su
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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

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