Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cay phoi » cap phoi, tay hoi, cay cho
lam thuc » lam thuoc, am thuc, nam thuc
sach phu » sach thu, sach phat, sach thue
hieu van » hieu va, thien van, hieu ve
phu lang » phap lang, phu khang, phu luong
xay hoi » xa hoi, tay hoi, gay thoi
thuc va » thuc vat, thuc dan, thuc day
dan lai » dan loai, dan lap, dan lat
lai cuu » lai cua, lai chau, lai cuoc
cuu tre » cua tre, cau tren, cau treo
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach phu lang ((xay hoi) OR (cay phoi)). ((hieu van) or (lieu va)) lam thuc va dan lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach phu lang ((xay hoi) OR (cay phoi)). ((hieu van) OR (lieu va)) lam thuc va dan lai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach phu lang ((xay hoi) OR (cay phoi)). ((hieu van) or (lieu va)) lam thuc va dan lai cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach phu lang ((xay hoi) OR (cay phoi)). ((hieu van) or (lieu va)) lam thuc va dan lai cuu tre*.