Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
va chao » va cao, va chat, va cham
va hanh » va thanh, va danh, ban hanh
doi cua » dai cua, hoi cua
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sach ty)) nang ma hoi. hieu va chao xu ((va hanh) or (van hanh)) doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang ma hoi. hieu va chao xu ((va hanh) OR (van hanh)) doi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang ma hoi. hieu va chao xu ((va hanh) or (van hanh)) doi cua triet*".