Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
phan duc » pham duc, phan tu, phan dau
sach ty » sach y, sach tu, sach thu
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
ke phan » ve phan, kenh phan, ke thang
hieu ke » hieu kem, chieu ke, hieu ky
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
nang xa » nang x, mang xa, ang xa
ve su » va 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 ty ((((nang xa) OR (lang xa))) or (nang ma)) hoi. hieu ke phan duc va hanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((((nang xa) OR (lang xa))) OR (nang ma)) hoi. hieu ke phan duc va hanh ve su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((((nang xa) OR (lang xa))) or (nang ma)) hoi. hieu ke phan duc va hanh ve su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((((nang xa) OR (lang xa))) or (nang ma)) hoi. hieu ke phan duc va hanh ve su triet*.