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
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
tu sach » thu sach, su sach, te sach
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hanh di » hanh vi, hanh de, hang di
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 sang ma hoi. hieu van luat thuc dan hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky sang ma hoi. hieu van luat thuc dan hanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky sang ma hoi. hieu van luat thuc dan hanh di cua vat*.