Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang co » nang cao, nang doc, nang noi
vu khac » vu kham, vu khanh, bui khac
co loi » co hoi
cam tu » cam thu, nam tu, tam tu
dam tu » nam tu, tam tu, dam thuc
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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) or (vu khac)) ky nang co loi. hieu va ((cam tu) or (dam tu)) va dan va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khac)) ky nang co loi. hieu va ((cam tu) OR (dam tu)) va dan va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khac)) ky nang co loi. hieu va ((cam tu) or (dam tu)) va dan va cua tre*.