Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
van anh » van thanh, tuan anh, van minh
loc van » luoc van, hoc van, lo van
cao loc » cao hoc, cao toc, cao oc
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi
va cao » va cac, va co, va dao
anh va » hanh 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: ((thuat sach) or (thuat lanh)) ky nang ((ma hoi) or (ma hoa)). lieu va cao loc van anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat lanh)) ky nang ((ma hoi) OR (ma hoa)). lieu va cao loc van anh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (thuat lanh)) ky nang ((ma hoi) or (ma hoa)). lieu va cao loc van anh va cua tre*.