Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
lam duc » lam duoc, pham duc, nam duoc
danh vi » dinh vi, danh di, danh va
luu tre » luu tru, cuu tre, luy tre

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

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