Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh hai » thanh hai, nhanh hai, hang hai
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
cac co » cac cong
co va » co ma, do va, so va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sach y)) nang xa hoi. ((hieu va) OR (lieu va)) cac co va hanh hai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ky) OR (sach y)) nang xa hoi. ((hieu va) or (lieu va)) cac co va hanh hai cua triet~".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) OR (sach y)) nang xa hoi. ((hieu va) or (lieu va)) cac co va hanh hai cua triet*.