Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh tai » thanh tai, hang tai, han tai
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, mang xa
tai cua » thai cua, tai cuc, tri cua
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
hieu ve » hieu van
dam tu » nam tu, cam tu, tam tu
te sac » te sach, te cac, te san
sac ky » cac ky, sai 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 sac ky ((nang xa) or (nang ma)) hoi. ((hieu ve) OR (hieu va)) dam tu va hanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (hieu va)) dam tu va hanh tai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang xa) or (nang ma)) hoi. ((hieu ve) OR (hieu va)) dam tu va hanh tai cua triet".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (nang ma)) hoi. ((hieu ve) OR (hieu va)) dam tu va hanh tai cua triet*.