Perhaps you should try some spelling variations:
luat thuc » luat thue, luat tuc, luan thuc
hieu van » hieu va, thien van, lieu va
van luat » dan luat, va luat, van xuat
van dinh » van minh, van dich, xuan dinh
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
va dinh » va kinh, va tinh, vu dinh
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu hoach)) ky nang ma hoi. hieu van luat thuc ((va dinh) OR (van dinh)) di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang ma hoi. hieu van luat thuc ((va dinh) OR (van dinh)) di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ky nang ma hoi. hieu van luat thuc ((va dinh) OR (van dinh)) di cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang ma hoi. hieu van luat thuc ((va dinh) OR (van dinh)) di cua vat*.