Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ve cham » va cham, ve chat, vu cham
va hanh » va thanh, va danh, ban hanh
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang xa hoi. hieu ((ve cham) or (ve cac)) duc ((va hanh) OR (van hanh)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang xa hoi. hieu ((ve cham) OR (ve cac)) duc ((va hanh) OR (van hanh)) vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang xa hoi. hieu ((ve cham) or (ve cac)) duc ((va hanh) OR (van hanh)) vi cua viet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. hieu ((ve cham) or (ve cac)) duc ((va hanh) OR (van hanh)) vi cua viet*.