Perhaps you should try some spelling variations:
trien nang » trien nong, trien mang, thien nang
va thanh » gia thanh, ban thanh, va tinh
thu sach » thuat sach, thuoc sach, thu hoach
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
cua tre » cua te, cua triet, dua tren
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc va

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