Perhaps you should try some spelling variations:
hanh kiem » khanh kiem, hanh kem, anh kiem
phan duc » pham duc, phan tu, phan dau
su triet » su tien, ve triet
chieu ke » hieu ky, hieu ve, hieu kem
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
ke phan » ve phan, kenh phan, ke thang
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
su viet » so viet

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)) hoi. chieu ke phan duc va hanh kiem ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (lang xa)) hoi. chieu ke phan duc va hanh kiem ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (lang xa)) hoi. chieu ke phan duc va hanh kiem ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (lang xa)) hoi. chieu ke phan duc va hanh kiem ((su triet) OR (su viet))*.