Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thanh lap » thanh san, phan lap, thanh hai
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
xuc va » duc va, tuc va, luc va
mo hoc » mon hoc, co hoc
ve cam » ve cham, ve cac, va cam
o hoc » co hoc, so hoc, y hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ((o hoc) or (mo hoc)). hieu ve cam xuc va thanh lap ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((o hoc) OR (mo hoc)). hieu ve cam xuc va thanh lap ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ((o hoc) or (mo hoc)). hieu ve cam xuc va thanh lap ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((o hoc) or (mo hoc)). hieu ve cam xuc va thanh lap ((cua triet) OR (su triet))*.