Perhaps you should try some spelling variations:
phap chuc » phap thuc, pham chuc, phap chu
sach thu » sach thue, sach thieu, sach tham
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
va phap » va phat, ban phap
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, mang may
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu ((nang ma) or (nang cao)) hoi. hieu va phap chuc ((va hanh) or (va danh)) vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu ((nang ma) OR (nang cao)) hoi. hieu va phap chuc ((va hanh) OR (va danh)) vai cua tu.
• Adding a wildcard symbol may retrieve word variants: so sach thu ((nang ma) or (nang cao)) hoi. hieu va phap chuc ((va hanh) or (va danh)) vai cua tu*.