Perhaps you should try some spelling variations:
hanh va » hang va, hanh vi
sach ly » sach lo, sach ty, sach hay
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
loc va » hoc va
luc va » duc va, tuc va
va cua » va chua, via cua, ca cua
va cau » van cau, va cac, va dau
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: thuat ((sach ly) or (sach y)) nang o hoi. hieu va cau ((loc va) OR (luc va)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ly) OR (sach y)) nang o hoi. hieu va cau ((loc va) OR (luc va)) hanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ly) or (sach y)) nang o hoi. hieu va cau ((loc va) OR (luc va)) hanh va cua tre*".