Perhaps you should try some spelling variations:
dang xay » dang van
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
cac loc » cac lop, cac toc, cac hoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
loc va » hoc va, luc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((dang xay) or (van xay)) hoi. ((hieu va) or (lieu va)) cac loc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((dang xay) OR (van xay)) hoi. ((hieu va) OR (lieu va)) cac loc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((dang xay) or (van xay)) hoi. ((hieu va) or (lieu va)) cac loc va hanh vi cua tre*.