Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hieu van » thien van, lieu va, hieu ve
dinh lam » dinh van, tinh lao
lam chau » lai chau, lam chu, lam chat
chau tre » chay tren, chau tho, cho tre
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
san ky » sang ky, van ky, dan ky
luc va » tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat san ky nang xa hoi. ((hieu va) or (hieu van)) coc ((luc va) or (duc va)) dinh lam chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat san ky nang xa hoi. ((hieu va) OR (hieu van)) coc ((luc va) OR (duc va)) dinh lam chau tre.
• Adding a wildcard symbol may retrieve word variants: thuat san ky nang xa hoi. ((hieu va) or (hieu van)) coc ((luc va) or (duc va)) dinh lam chau tre*.