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