Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
hac tuc » thac toc, thai tuc
danh di » danh du, danh dien, danh gia
xanh di » vanh dai, xanh tai
dinh vi » dinh ve, dinh viet, dinh tri
va hac » van hac, va khac, va cac
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu va hac tuc va ((dinh vi) or (((danh di) OR (xanh di)))) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu va hac tuc va ((dinh vi) OR (((danh di) OR (xanh di)))) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu va hac tuc va ((dinh vi) or (((danh di) OR (xanh di)))) cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu va hac tuc va ((dinh vi) or (((danh di) OR (xanh di)))) cau tren*.