Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
xuc va » duc va, tuc va, luc va
vi cu » vi xu, vi du
vi su » va su, ve su, ki su

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

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