Perhaps you should try some spelling variations:
thuat thanh » thuan thanh, thuat than, thuat toan
thanh lay » thanh lap, thanh tay, thanh lam
hieu van » thien van, lieu va
lay nang » may nang, day nang, ly nang
hanh tai » thanh tai, hang tai, han tai
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
cau loc » hau loc, cau hoc, cau luc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
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))) or (hieu van)) cau loc va hanh 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))) OR (hieu van)) cau loc va hanh 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))) or (hieu van)) cau loc va hanh tai cua tre*".