Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
lam cuu » lam chu, lam cua, cham cuu
hieu va » lieu va, hieu qua
sach ly » sach y, sach ty, sach hay
sach lo » sach dao, sach doi, sach hoi
di cua » dai cua, doi cua, de cua
cua cu » cua chu, cua cau, cua su
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ly) OR (sach lo)) nang x hoi. ((hieu van) OR (hieu va)) lam cuu van hanh di cua cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ly) or (sach lo)) nang x hoi. ((hieu van) OR (hieu va)) lam cuu van hanh di cua cu~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ly) or (sach lo)) nang x hoi. ((hieu van) OR (hieu va)) lam cuu van hanh di cua cu*.