Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
dang xay » dang van, van xay
cua tre » cua te, cuu tre, cua triet
nang va » nang van, hang va, nang ma
luc cam » luc lam, luc tam, xuc cam
lam luc » lao luc, lam duoc
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
va lam » van lam, va lap
cua tu » cua tuc, cua su, cua cu

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) or (doc sach)) ty dang xay hoi. hieu va lam luc cam nang va ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty dang xay hoi. hieu va lam luc cam nang va ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ty dang xay hoi. hieu va lam luc cam nang va ((cua tre) or (cua tu))*.