Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
cam tuc » cam tu, nam thuc, dam thuc
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tai va » thai va, mai va, tri va
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ma hoi. lieu va ((((cam tuc) or (nam thuoc))) or (cam xuc)) van hanh tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. lieu va ((((cam tuc) OR (nam thuoc))) OR (cam xuc)) van hanh tai va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. lieu va ((((cam tuc) or (nam thuoc))) or (cam xuc)) van hanh tai va thiet*.