Perhaps you should try some spelling variations:
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
phap ly » phap day
sach ky » sac ky, sach ty, sach kem
va phap » va phat, ban phap
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
le cua » ly cua
cua te » cua tu

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

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