Perhaps you should try some spelling variations:
duy sang » duy van, duy can, duy anh
te sach » toc sach
hieu va » lieu va, hieu qua
cao luc » bao luc, cao duc, cao suc
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc 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: te sach ((duy sang) or (ky nang)) ((ma hoa) or (xa hoi)). hieu va cao luc va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((duy sang) OR (ky nang)) ((ma hoa) OR (xa hoi)). hieu va cao luc va danh va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((duy sang) or (ky nang)) ((ma hoa) or (xa hoi)). hieu va cao luc va danh va cua tre*.