Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
nam truc » nam truoc, nam trung, nam thuoc
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
tu cach » tu cac
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
doi cua » dai cua, hoi cua
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: ((tu cach) or (tu sach)) ky nang ma hoi. lieu va ((nam thuc) or (nam truc)) van hanh doi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (tu sach)) ky nang ma hoi. lieu va ((nam thuc) OR (nam truc)) van hanh doi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (tu sach)) ky nang ma hoi. lieu va ((nam thuc) or (nam truc)) van hanh doi cua vat*.