Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
phat duy » pham duy, phat huy, phan duy
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
va hanh » van hanh, va thanh, va danh
xang xa » lang xa, mang xa, dang xay
tu sach » thu sach, su sach, te sach
ang xa » lang xa, mang xa, dang xay
duy va » duy vat, duy van, day 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 tu ((xang xa) or (ang xa)) hoi. hieu va phat duy va hanh lai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((xang xa) OR (ang xa)) hoi. hieu va phat duy va hanh lai ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu ((xang xa) or (ang xa)) hoi. hieu va phat duy va hanh lai ((cua triet) OR (va triet))*".