Perhaps you should try some spelling variations:
hanh vinh » thanh vinh, khanh vinh, hanh tinh
vinh cua » sinh cua, tinh cua, dinh cua
van hanh » van thanh, ban hanh, van anh
hieu van » thien van, lieu va, hieu ve
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
sac ky » sai ky
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: tu ((sac ky) OR (cac ky)) nang x hoi. ((hieu va) or (hieu van)) cac luc van hanh vinh cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) nang x hoi. ((hieu va) OR (hieu van)) cac luc van hanh vinh cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (cac ky)) nang x hoi. ((hieu va) or (hieu van)) cac luc van hanh vinh cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (cac ky)) nang x hoi. ((hieu va) or (hieu van)) cac luc van hanh vinh cua te*.