Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh luc » thanh luu, than luc, nhan luc
van hanh » ban hanh, van anh, van ban
hieu van » hieu va, thien van, lieu va
va hanh » va thanh, va danh, ban hanh
su sach » so sach
cao hoi » cau hoi, co hoi, cao hoc
vu nang » vuc nang, va nang, vu dang
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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) OR (vu sach)) vu nang cao hoi. hieu van thanh luc ((va hanh) or (van hanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) vu nang cao hoi. hieu van thanh luc ((va hanh) OR (van hanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) vu nang cao hoi. hieu van thanh luc ((va hanh) or (van hanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) vu nang cao hoi. hieu van thanh luc ((va hanh) or (van hanh)) di cua tre*.