Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sang ky » sang kyo, tang ky, bang ky
dang ky » dang y, dan ky, dong ky
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
hanh va » hang va, hanh vi
che tre » cho tre, khoe tre, choi tre
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sang ky) OR (dang ky)) lang xa hoi. hieu ve cac luc van hanh va che tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sang ky) OR (dang ky)) lang xa hoi. hieu ve cac luc van hanh va che tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sang ky) OR (dang ky)) lang xa hoi. hieu ve cac luc van hanh va che tre*.