Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
tham xuc » tham nuoc, pham duc, cam xuc
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nano » truc nano
nano ma » nang ma, nano va, nano bac
hanh ki » hanh vi, hanh ky, hanh kien
su viet » so viet
ma hoi » mai hoi, xa hoi, ma hoa
ki su » ky su

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 nano ma hoi. hieu qua ((tham xuc) or (tham thuc)) van hanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nano ma hoi. hieu qua ((tham xuc) OR (tham thuc)) van hanh ki su viet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nano ma hoi. hieu qua ((tham xuc) or (tham thuc)) van hanh ki su viet*.