Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
cuu tre » cau tren, cau treo
tu anh » tu hanh, tu manh, thu anh
luc va » duc va, tuc va, loc va
tu ang » tu lang, tu anc, tu quang

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