Perhaps you should try some spelling variations:
chat triet » chet triet, chat thien, cua triet
ban thanh » ban hanh, ban hang
thanh ly » thanh lay, thanh ky, thanh le
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
dua ban » dia ban, cua ban, qua ban
y nang » ky nang, ly nang, v nang
mo hoc » mon hoc, co hoc
co dua » co cua, ca dua, co da
o hoi » co hoi, o hoc, o hai
va co » vo co
phat » phan, pham, phap

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 y nang ((o hoi) or (mo hoc)). hieu va co dua ban thanh ly ((chat triet) OR (phat trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hoi) OR (mo hoc)). hieu va co dua ban thanh ly ((chat triet) OR (phat trien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((o hoi) or (mo hoc)). hieu va co dua ban thanh ly ((chat triet) OR (phat trien))*".