Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
thu cac » tu cac, thu xac, thu cuc
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
cac lo » cac lop, cac co, cac bo
o hoc » mo hoc, so hoc, y hoc
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu cac ky nang ((o hoc) OR (co hoc)). hieu va cac lo va danh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu cac ky nang ((o hoc) OR (co hoc)). hieu va cac lo va danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu cac ky nang ((o hoc) OR (co hoc)). hieu va cac lo va danh vai cua tre*.