Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
van hanh » van thanh, ban hanh, van anh
tham xuc » tham nuoc, pham duc, cam xuc
hanh ky » hanh kem
sach tu » sach thu, sach ty, sach uu
nang ma » tang ma, sang ma, nang cao
cach tu » cach thuc
su viet » so viet
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 ((sach tu) OR (cach tu)) nang ma hoi. hieu qua ((tham xuc) or (tham thuc)) van hanh ky su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (cach tu)) nang ma hoi. hieu qua ((tham xuc) OR (tham thuc)) van hanh ky su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) OR (cach tu)) nang ma hoi. hieu qua ((tham xuc) or (tham thuc)) van hanh ky su viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) OR (cach tu)) nang ma hoi. hieu qua ((tham xuc) or (tham thuc)) van hanh ky su viet*.