Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
cham cuu » cap cuu, chat cua
ban vanh » ban hanh, ban van, ban anh
vanh dai » van dai, vanh tai, lanh dao
ky dang » ky nang
ky danh » ky anh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet

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 ((ky dang) OR (ky danh)) xa hoi. hieu ve ((cham cuu) or (pham duc)) ban vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ((ky dang) OR (ky danh)) xa hoi. hieu ve ((cham cuu) OR (pham duc)) ban vanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ((ky dang) OR (ky danh)) xa hoi. hieu ve ((cham cuu) or (pham duc)) ban vanh dai cua tre*".