Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
cham cuu » cap cuu, chat cua
cua tre » cua te, cuu tre, cua triet
cam cuu » cap cuu
van hoe » van hoa, van hoc, van hieu
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ((ky lang) or (ky dang)) van hoe. hieu van ((cam cuu) or (cham cuu)) ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky lang) OR (ky dang)) van hoe. hieu van ((cam cuu) OR (cham cuu)) ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ((ky lang) or (ky dang)) van hoe. hieu van ((cam cuu) or (cham cuu)) ban hanh vi cua tre*.