Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thu xang » thu bang, thu dang, thu sang
thu hang » thi hang, thuc hanh, thu huong
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
anh va » hanh va
va cua » va chua, via cua, ca cua
va dai » va dao, vi dai, va dau

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 ((thu xang) OR (thu hang)) xa hoi. hieu va dai ((truc va) or (thuc va)) anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((thu xang) OR (thu hang)) xa hoi. hieu va dai ((truc va) OR (thuc va)) anh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((thu xang) OR (thu hang)) xa hoi. hieu va dai ((truc va) or (thuc va)) anh va cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((thu xang) OR (thu hang)) xa hoi. hieu va dai ((truc va) or (thuc va)) anh va cua tre*.