Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
vat hanh » vat thanh, van hanh, va hanh
va san » va ban
ve nam » he nam, va nam, te nam
le nam » ly nam, he nam, le na
vi cua » vai cua, di cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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) or (va san)) ky nang x hoi. hieu ((ve nam) or (le nam)) thuc vat hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (va san)) ky nang x hoi. hieu ((ve nam) OR (le nam)) thuc vat hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (va san)) ky nang x hoi. hieu ((ve nam) or (le nam)) thuc vat hanh vi cua te*.