Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
pham tai » pham thi, pham van
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, mang xa
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
tai va » thai va, mai va, tri va
te sai » te tai, te bai, te lai
sai ky » sac 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 sai ky ((nang xa) or (nang ma)) hoi. ((hieu ve) OR (hieu va)) pham tai va dinh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (hieu va)) pham tai va dinh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky ((nang xa) or (nang ma)) hoi. ((hieu ve) OR (hieu va)) pham tai va dinh va su triet".
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang xa) or (nang ma)) hoi. ((hieu ve) OR (hieu va)) pham tai va dinh va su triet*.