Perhaps you should try some spelling variations:
nang dau » hang dau, xang dau, nang du
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
cua cu » cua chu, cua cau, cua su
luc va » duc va, tuc va
loc va » hoc 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: te sach ky nang x hoi. hieu va cham ((loc va) OR (luc va)) nang dau ((cua tre) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu va cham ((loc va) OR (luc va)) nang dau ((cua tre) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu va cham ((loc va) OR (luc va)) nang dau ((cua tre) or (cua cu))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu va cham ((loc va) OR (luc va)) nang dau ((cua tre) or (cua cu))*.