Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu nang » thi nang, thu hang, tho nang
thai cua » than cua, tai cuc, tri cua
thu bang » thu ban, thu hang, chu bang
ban hanh » ban hang
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, su sach, vu khach
bao duc » dao duc, bao luc, cao duc
van bao » van ban, van dao
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((thu nang) OR (thu bang)) xa hoi. hieu van bao duc ((va hanh) or (ban hanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((thu nang) OR (thu bang)) xa hoi. hieu van bao duc ((va hanh) OR (ban hanh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((thu nang) OR (thu bang)) xa hoi. hieu van bao duc ((va hanh) or (ban hanh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ((thu nang) OR (thu bang)) xa hoi. hieu van bao duc ((va hanh) or (ban hanh)) thai cua tre*.