Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
van bac » van ban, van hac, dan bac
van bao » van ban, van dao
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va chat » van chat, va phat, cao chat
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu ((van bac) or (van bao)) duc va hanh va chat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu ((van bac) OR (van bao)) duc va hanh va chat triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) OR (nang ma)) hoi. hieu ((van bac) or (van bao)) duc va hanh va chat triet*".