Perhaps you should try some spelling variations:
ve triet » va trien, su triet
dien cac » vien cac, dien cuc, dien sach
bien cac » vien cac, bien ca, hien cac
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, mang xa
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
xuc va » duc va, tuc va, luc va
va ve » va de, va le, va vi

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 ((nang xa) or (nang ma)) hoi. thieu ((bien cac) OR (dien cac)) xuc va hanh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. thieu ((bien cac) OR (dien cac)) xuc va hanh va ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (nang ma)) hoi. thieu ((bien cac) OR (dien cac)) xuc va hanh va ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang ma)) hoi. thieu ((bien cac) OR (dien cac)) xuc va hanh va ve triet*.