Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
cam truc » cau truc, nam truc, lam truoc
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach y)) nang x hoi. hieu va cam truc ((van hanh) or (va danh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach y)) nang x hoi. hieu va cam truc ((van hanh) OR (va danh)) vi cua triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach y)) nang x hoi. hieu va cam truc ((van hanh) or (va danh)) vi cua triet*.