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, nang cao, mang may
sang ma » tang ma, sang tao, mang may
va pham » van pham, va phat, va phap
tai va » thai va, mai va, tri va
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (((nang ma) OR (sang ma)))) hoi. hieu va pham tai va dinh va su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang xa) or (((nang ma) OR (sang ma)))) hoi. hieu va pham tai va dinh va su triet~".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (((nang ma) OR (sang ma)))) hoi. hieu va pham tai va dinh va su triet*.