Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tam thuc » tham thuc, am thuc, nam thuc
van hanh » van thanh, ban hanh, van anh
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
va hanh » va thanh, va danh, ban hanh
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
va tam » van tam, va tham, va tac
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 (sac ky)) nang ma hoi. lieu va tam thuc ((va hanh) OR (van hanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) nang ma hoi. lieu va tam thuc ((va hanh) OR (van hanh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) or (sac ky)) nang ma hoi. lieu va tam thuc ((va hanh) OR (van hanh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) or (sac ky)) nang ma hoi. lieu va tam thuc ((va hanh) OR (van hanh)) vi cua triet*.