Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
nang van » dang van, tang van, lang van
xuc cam » phuc cam
cua tre » cua te, cuu tre, cua triet
luc cam » luc lam, luc tam, luc cao
sach ty » sach y, sach tu, sach thu
van lam » van nam
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
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 ty dang xay hoi. hieu van lam ((luc cam) or (xuc cam)) nang van ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty dang xay hoi. hieu van lam ((luc cam) OR (xuc cam)) nang van ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: toc sach ty dang xay hoi. hieu van lam ((luc cam) or (xuc cam)) nang van ((cua tre) or (cua tu))*.