Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van bac » van bao, van hac, dan bac
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
cua te » cua tu

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 hoi. hieu ((((van bac) OR (van ban))) or (ban hanh)) truc va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((((van bac) OR (van ban))) OR (ban hanh)) truc va hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((((van bac) OR (van ban))) or (ban hanh)) truc va hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((((van bac) OR (van ban))) or (ban hanh)) truc va hanh di cua te*.