Perhaps you should try some spelling variations:
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
sang ky » sang kyo, dang ky, tang ky
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa
dan ky » van ky
va cam » va cham, va cac, va cao
di su » doi su, da su, de su
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((dan ky) or (sang ky)) lang xa hoi. hieu va cam tuc va hanh ((di su) OR (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((dan ky) OR (sang ky)) lang xa hoi. hieu va cam tuc va hanh ((di su) OR (ki su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((dan ky) or (sang ky)) lang xa hoi. hieu va cam tuc va hanh ((di su) OR (ki su)) triet".
• Adding a wildcard symbol may retrieve word variants: tu ((dan ky) or (sang ky)) lang xa hoi. hieu va cam tuc va hanh ((di su) OR (ki su)) triet*.