Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » cua viet, su triet, va triet
vu khach » vu khanh, vu khac, vay khach
khach ty » sach ty
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ty nang xa hoi. ((hieu ve) or (hieu va)) pham duc ((van ban) or (van thanh)) di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ty nang xa hoi. ((hieu ve) OR (hieu va)) pham duc ((van ban) OR (van thanh)) di cua triet.
• Adding a wildcard symbol may retrieve word variants: vu khach ty nang xa hoi. ((hieu ve) or (hieu va)) pham duc ((van ban) or (van thanh)) di cua triet*.