Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
ban hanh » ban hang
vinh cau » sinh cau, vinh cuu, minh cau
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ke » hieu kem, chieu ke, hieu ky
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
ke cau » ket cau

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 ky nang cao hoi. hieu ke cau luc ((((va hanh) or (ban hanh))) or (van thanh)) vinh cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cao hoi. hieu ke cau luc ((((va hanh) OR (ban hanh))) OR (van thanh)) vinh cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cao hoi. hieu ke cau luc ((((va hanh) or (ban hanh))) or (van thanh)) vinh cau tren*.