Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vat thanh » dat thanh, gat thanh, tat thanh
va trien » va truyen, va thiet, va tuyen
thanh do » thanh de, thanh pho, thanh hoa
phap duy » phap day, pham duy, phan duy
sach tu » sach thu, cach tu, sach uu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach thu, xach tay
va phap » va phat, ban phap

You may be able to get more results by adjusting your search query.

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