Perhaps you should try some spelling variations:
kenh phan » benh nhan, benh phau
hanh kiem » khanh kiem, hanh kem, anh kiem
thu triet » tu triet, su triet, cau triet
kiem thu » kieu thu, kien thuc, diem thuc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
ke phan » ve phan, ke thang
va hanh » van hanh, va thanh, va danh

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