Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
minh dao » minh danh, minh giao, lanh dao
dinh dao » dinh dat, dinh cao, trinh dao
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
xuc va » duc va, tuc va, luc va

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. ((hieu ve) or (hieu van)) cam xuc va ((dinh dao) OR (minh dao)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. ((hieu ve) OR (hieu van)) cam xuc va ((dinh dao) OR (minh dao)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((hieu ve) or (hieu van)) cam xuc va ((dinh dao) OR (minh dao)) cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu ve) or (hieu van)) cam xuc va ((dinh dao) OR (minh dao)) cau tren*.