Perhaps you should try some spelling variations:
dinh cuu » dinh chi
luat tuc » luat thue
tuc may » truc may, tu may, tuc xay
va luat » va thuat, vay luan, cua luat
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
di cuu » di cau, di cua

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 (sac ky)) nang ma hoi. hieu va luat tuc may tinh ((di cuu) OR (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang ma hoi. hieu va luat tuc may tinh ((di cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sac ky)) nang ma hoi. hieu va luat tuc may tinh ((di cuu) OR (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) nang ma hoi. hieu va luat tuc may tinh ((di cuu) OR (dinh cuu)) tre*.