Perhaps you should try some spelling variations:
dan thiet » luan thiet, toan thiet, doan thien
ban hanh » ban hang
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, dao hanh
va danh » va dinh, va dan, dia danh
sach lo » sach dao, sach doi, sach hoi
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
lo nang » ho nang, ly nang, loai nang
ve cau » ke cau, va cau, ve cac
ma hoi » mai hoi, xa hoi, ma hoa
vi dan » voi dan, vi dai, va dan

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 lo nang ma hoi. hieu ve cau luc ((((va danh) OR (va hanh))) or (ban hanh)) vi dan thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach lo nang ma hoi. hieu ve cau luc ((((va danh) OR (va hanh))) OR (ban hanh)) vi dan thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach lo nang ma hoi. hieu ve cau luc ((((va danh) OR (va hanh))) or (ban hanh)) vi dan thiet".
• Adding a wildcard symbol may retrieve word variants: su sach lo nang ma hoi. hieu ve cau luc ((((va danh) OR (va hanh))) or (ban hanh)) vi dan thiet*.