Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh van » thanh san, thanh toan, thanh phan
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va cuu » va chu, va huu
va cau » van cau, va cac, va dau

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