Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cam dua » ca dua, cay dua, chay dua
dua ban » dia ban, cua ban, qua ban
danh va » doanh va, dan va, dang va
hanh va » hang va, hanh vi
su viet » so viet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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 y nang xa hoi. lieu va cam dua ban ((((danh va) OR (anh va))) or (hanh va)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. lieu va cam dua ban ((((danh va) OR (anh va))) OR (hanh va)) su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. lieu va cam dua ban ((((danh va) OR (anh va))) or (hanh va)) su viet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. lieu va cam dua ban ((((danh va) OR (anh va))) or (hanh va)) su viet*.