Perhaps you should try some spelling variations:
chat hoc » chat hoa, chat thom, cho hoc
hieu van » hieu va, thien van, lieu va
so hanh » so sanh, so danh, co hanh
hanh ky » hanh kem
van cau » van dau, van hau, van chat
cau xuc » cam xuc, cau luc, cau truc
xuc cac » xuc tac, tuc cac, xuc cam
dan va » doan va, ban va, han va
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so hanh ky nang ((chat hoc) or (co hoc)). hieu van cau xuc cac ((dan va) or (dan ca)) cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so hanh ky nang ((chat hoc) OR (co hoc)). hieu van cau xuc cac ((dan va) OR (dan ca)) cua cu.
• Adding a wildcard symbol may retrieve word variants: so hanh ky nang ((chat hoc) or (co hoc)). hieu van cau xuc cac ((dan va) or (dan ca)) cua cu*.