Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
cau luc » cau truc, cau phuc
cam luc » cam xuc
hieu va » lieu va, hieu qua
ky dang » ky danh
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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