Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ve triet » va trien, su triet
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
nam tu » nam thuc
va ve » va de, va le, va vi

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 ((nang ma) OR (tang ma)) hoi. hieu ve ((nam tu) or (nam thu)) va danh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang ma) OR (tang ma)) hoi. hieu ve ((nam tu) OR (nam thu)) va danh va ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang ma) OR (tang ma)) hoi. hieu ve ((nam tu) or (nam thu)) va danh va ve triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang ma) OR (tang ma)) hoi. hieu ve ((nam tu) or (nam thu)) va danh va ve triet*.