Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
vien cac » vien bach, vien dai, vien da
thu sac » thu sach, thu san, thu xac
hai cua » thai cua, hoi cua, lai cua
xuc van » duc van, luc van, vuc van
sac ky » cac ky, sai ky
ve cac » va cac
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang o hoi. hieu ((ve cac) or (vien cac)) xuc van thanh ((hai cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang o hoi. hieu ((ve cac) OR (vien cac)) xuc van thanh ((hai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang o hoi. hieu ((ve cac) or (vien cac)) xuc van thanh ((hai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang o hoi. hieu ((ve cac) or (vien cac)) xuc van thanh ((hai cua) OR (dai cua)) tre*.