Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang dau » hang dau, xang dau, nang du
va thanh » gia thanh, ban thanh, va tinh
va triet » va thiet, va trien, ve triet
nang dai » nang tai, lang dai, nang cai
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
tham lo » tham do, tham hoa, pham lao
va hanh » van hanh, va danh, ban hanh
va tham » van tham, va cham, va thuat
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 ty ((nang dai) OR (nang dau)) hai. hieu va tham lo ((va hanh) or (va thanh)) tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang dai) OR (nang dau)) hai. hieu va tham lo ((va hanh) OR (va thanh)) tai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang dai) OR (nang dau)) hai. hieu va tham lo ((va hanh) or (va thanh)) tai va triet*".