Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, mang may
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
duc van » duc va, duc tan, duc manh
tai va » thai va, mai va, tri va

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 nha ((((nang ma) OR (nang cao))) or (nang x)) hoi. hieu su cham duc van hanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach nha ((((nang ma) OR (nang cao))) OR (nang x)) hoi. hieu su cham duc van hanh tai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach nha ((((nang ma) OR (nang cao))) or (nang x)) hoi. hieu su cham duc van hanh tai va triet*".