Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
loc va » hoc va
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (su sach)) ky nang xa hoi. hieu ve cam ((luc va) OR (loc va)) thanh vi cau thi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (su sach)) ky nang xa hoi. hieu ve cam ((luc va) OR (loc va)) thanh vi cau thi.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (su sach)) ky nang xa hoi. hieu ve cam ((luc va) OR (loc va)) thanh vi cau thi".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (su sach)) ky nang xa hoi. hieu ve cam ((luc va) OR (loc va)) thanh vi cau thi*.