Perhaps you should try some spelling variations:
hieu ket » hieu kem, thien ket, lien ket
thanh vi » hanh vi, thanh va, thanh ve
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
tuc va » thuc va, truc va, tuc xa
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
luc va » duc va, loc va
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang o hoi. hieu ket cau ((luc va) OR (tuc va)) thanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang o hoi. hieu ket cau ((luc va) OR (tuc va)) thanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang o hoi. hieu ket cau ((luc va) OR (tuc va)) thanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang o hoi. hieu ket cau ((luc va) OR (tuc va)) thanh vi ((cua tre) or (cuu tre))*.