Perhaps you should try some spelling variations:
sach tham » sach nha
thu sach » tu sach, thuat sach, thuoc sach
lang van » dang van, tang van, hoang van
ve cham » va cham, ve chat, vu cham
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan 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: thu sach tham ((lang xa) OR (lang van)) hoi. hieu ((ve cham) or (va cac)) xuc va dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tham ((lang xa) OR (lang van)) hoi. hieu ((ve cham) OR (va cac)) xuc va dan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tham ((lang xa) OR (lang van)) hoi. hieu ((ve cham) or (va cac)) xuc va dan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach tham ((lang xa) OR (lang van)) hoi. hieu ((ve cham) or (va cac)) xuc va dan vi cua tre*.