Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh duc » thach duc, than duc, thinh duc
hieu van » hieu va, thien van, lieu va
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach
vu sach » vu bach, vu khach
vu nang » vuc nang, va nang, vu dang
nang co » nang cao, nang doc, nang noi
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi

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 co hoi. hieu van thanh duc va hanh doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) vu nang co hoi. hieu van thanh duc va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) vu nang co hoi. hieu van thanh duc va hanh doi cua tre*.