Perhaps you should try some spelling variations:
luat duoc » luat tuc
cau treo » cau theo, cau tren, cau triet
dat duoc » dat nuoc, da duoc, xuat duoc
hanh di » hanh vi, hanh de, hang di
ma hanh » va hanh, da hanh, na hanh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
di cau » da cau, diem cau
sac ky » cac ky
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sac ky) or (sai ky)) nang ma hoi. hieu ve ((dat duoc) OR (luat duoc)) ma hanh di cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sac ky) OR (sai ky)) nang ma hoi. hieu ve ((dat duoc) OR (luat duoc)) ma hanh di cau treo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sac ky) or (sai ky)) nang ma hoi. hieu ve ((dat duoc) OR (luat duoc)) ma hanh di cau treo*".