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

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 cac loc ((van hanh) OR (van anh)) 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 cac loc ((van hanh) OR (van anh)) 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 cac loc ((van hanh) OR (van anh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang xa) or (lang xa)) hoi. hieu ve cac loc ((van hanh) OR (van anh)) di cua te*.