Perhaps you should try some spelling variations:
thuat thanh » thuan thanh, thuat than, thuat toan
thanh lay » thanh lap, thanh tay, thanh lam
lay nang » may nang, day nang, ly nang
hang tai » hang va, dung tai
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
hieu va » lieu va, hieu qua
loc va » luc va
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: thuat thanh lay nang x hoi. ((hieu ve) or (hieu va)) cau ((loc va) OR (hoc va)) hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat thanh lay nang x hoi. ((hieu ve) OR (hieu va)) cau ((loc va) OR (hoc va)) hang tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat thanh lay nang x hoi. ((hieu ve) or (hieu va)) cau ((loc va) OR (hoc va)) hang tai cua tre*".