Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thanh dai » thanh hai, thanh tai, thanh dat
su triet » su viet, su tien, ve triet
van chat » cao chat
va thanh » gia thanh, ban thanh, va tinh
chat duc » chat xuc, chat doc, chet duoc
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
so hai » son hai, su hai, so ha
o hai » co hai, o lai, _ hai

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