Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
va cham » va chat, va tham
sang ky » sang kyo, dang ky, tang ky
xay hoi » xa hoi, tay hoi, cay phoi
dan ky » van ky
va cam » va cac, va cao, va cai
di su » doi su, ki su, da 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 ((sang ky) or (dan ky)) dang xay hoi. lieu ((va cam) OR (va cham)) xuc van hanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sang ky) OR (dan ky)) dang xay hoi. lieu ((va cam) OR (va cham)) xuc van hanh di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sang ky) or (dan ky)) dang xay hoi. lieu ((va cam) OR (va cham)) xuc van hanh di su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sang ky) or (dan ky)) dang xay hoi. lieu ((va cam) OR (va cham)) xuc van hanh di su triet*.