Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cac loc » cac lop, cac toc, cac hoc
nang xa » nang x, nang ma, mang xa
hanh di » hanh vi, hanh de, hang di
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
loc van » luoc van, hoc van, lo van
hieu va » lieu va, hieu qua
te sai » te tai, te bai, te lai
di cua » dai cua, doi cua, de cua
cua te » cua tu
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky ((nang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu va)) cac loc van hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((nang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu va)) cac loc van hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky ((nang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu va)) cac loc van hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu va)) cac loc van hanh di cua te*.