Perhaps you should try some spelling variations:
thang thanh » tang thanh, thanh thanh, thong thanh
hang thanh » hoang thanh, dang thanh, tang thanh
chat thu » chat thai, chat thom, chat nhua
vu khac » vu kham, vu khanh, bui khac
va chat » van chat, va phat, cao chat
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khac) or (tu sach)) ky nang x hoi. lieu va chat thu ((hang thanh) OR (thang thanh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khac) OR (tu sach)) ky nang x hoi. lieu va chat thu ((hang thanh) OR (thang thanh)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khac) or (tu sach)) ky nang x hoi. lieu va chat thu ((hang thanh) OR (thang thanh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khac) or (tu sach)) ky nang x hoi. lieu va chat thu ((hang thanh) OR (thang thanh)) va cua tre*.