Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
chat duc » chat xuc, chat doc, chet duoc
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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. ((hieu quan) or (hieu qua)) chat duc va thanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang o hai. ((hieu quan) OR (hieu qua)) chat duc va thanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hai. ((hieu quan) or (hieu qua)) chat duc va thanh dai cua triet*.