Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
ban than » ban thanh, van thanh, ban hang
than cuu » than cua, than cui, thanh luu
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo

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 xa hoi. ((hieu van) OR (hieu va)) hau ((xuc van) or (duc van)) ban than cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang xa hoi. ((hieu van) OR (hieu va)) hau ((xuc van) OR (duc van)) ban than cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang xa hoi. ((hieu van) OR (hieu va)) hau ((xuc van) or (duc van)) ban than cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang xa hoi. ((hieu van) OR (hieu va)) hau ((xuc van) or (duc van)) ban than cuu tre*.