Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tham luc » than luc, tham nuoc, tham thuc
van hanh » van thanh, ban hanh, van ban
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
van anh » van thanh, tuan anh, van minh
va tham » van tham, va cham, va thanh
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

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