Perhaps you should try some spelling variations:
hieu cao » chieu cao, hieu cac, hieu ca
chat luc » chat xuc, chat lua, nhan luc
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang ca » hang va, nang cao, hang tai
ca hoi » cau hoi, cua hoi, xa hoi
lam va » nam va, dam va, lam ha
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 ty hang ca hoi. hieu cao chat luc ((van hanh) or (ban hanh)) lam va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang ca hoi. hieu cao chat luc ((van hanh) OR (ban hanh)) lam va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ty hang ca hoi. hieu cao chat luc ((van hanh) or (ban hanh)) lam va thiet*.