Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van luat » dan luat, va luat, van luan
van xuat » san xuat, va xuat, phan xuat
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
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 sach)) ky nang ma hoi. hieu ((van luat) or (van xuat)) thuc va hang di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu ((van luat) OR (van xuat)) thuc va hang di cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ma hoi. hieu ((van luat) or (van xuat)) thuc va hang di cua vat*.