Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
lang van » dang van, tang van, hoang van
dang xay » dang van, van xay
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
sach lo » sach dao, sach doi, sach moi
va cam » va cham, va cac, va cao
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach lo) OR (sach hoi)) ((lang van) or (dang xay)) hoi. hieu va cam duc va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach lo) OR (sach hoi)) ((lang van) OR (dang xay)) hoi. hieu va cam duc va hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach lo) OR (sach hoi)) ((lang van) or (dang xay)) hoi. hieu va cam duc va hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach lo) OR (sach hoi)) ((lang van) or (dang xay)) hoi. hieu va cam duc va hanh va cua te*.