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
hieu ve » hieu van
hieu va » lieu va, hieu qua
cau loc » hau loc, cau hoc, cau luc
va hang » van hang, va nang, va lang
tai cua » thai cua, tri cua, dai cua
loc va » hoc 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 hang ((tai cua) OR (tai cuc)) 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 hang ((tai cua) OR (tai cuc)) 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 hang ((tai cua) OR (tai cuc)) tre*".