Perhaps you should try some spelling variations:
sach dao » lanh dao
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
tuc va » thuc va, tuc xa, duc va
dan di » danh di, dan da, dan de
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cao
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: toc ((sach v) or (sach dao)) nang x hoi. hieu va cam ((tuc va) OR (truc va)) dan di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach v) OR (sach dao)) nang x hoi. hieu va cam ((tuc va) OR (truc va)) dan di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach v) or (sach dao)) nang x hoi. hieu va cam ((tuc va) OR (truc va)) dan di cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach v) or (sach dao)) nang x hoi. hieu va cam ((tuc va) OR (truc va)) dan di cua tre*.