Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh doi » thanh doi, hanh noi, hang doi
sach ky » sach y, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
cac day » cac dan, cac dai, cac cay
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sac ky » cac ky, sai ky
doi su » oi su, don su, voi 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 ((sach ky) or (sac ky)) ((nang xa) OR (nang ma)) hoi. hieu va cac day va hanh doi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) ((nang xa) OR (nang ma)) hoi. hieu va cac day va hanh doi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) ((nang xa) OR (nang ma)) hoi. hieu va cac day va hanh doi su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) ((nang xa) OR (nang ma)) hoi. hieu va cac day va hanh doi su triet*.