Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien nong » trien cong
dau tren » dau tien, dat tren, dau tieng
va triet » va thiet, va trien, ve triet
thanh vi » thanh va, thanh ve, nhanh vi
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
nong x » nong xa, nang x, nong e
xuc va » duc va, tuc va, luc va
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: tu sach trien nong x hoi. hieu va cam xuc va ((thanh vi) OR (hanh vi)) ((va triet) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach trien nong x hoi. hieu va cam xuc va ((thanh vi) OR (hanh vi)) ((va triet) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach trien nong x hoi. hieu va cam xuc va ((thanh vi) OR (hanh vi)) ((va triet) or (dau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach trien nong x hoi. hieu va cam xuc va ((thanh vi) OR (hanh vi)) ((va triet) or (dau tren))*.