Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
truc van » truc va, thuc van, truc ban
dai truc » dai thuc, doan truc, dai trung
dang xay » dang van, van xay
hanh va » hang va, hanh vi
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
ang xa » lang xa, mang xa, hoang xa
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 ty ((ang xa) OR (dang xay)) hoi. hieu va dai truc van ((anh va) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((ang xa) OR (dang xay)) hoi. hieu va dai truc van ((anh va) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((ang xa) OR (dang xay)) hoi. hieu va dai truc van ((anh va) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((ang xa) OR (dang xay)) hoi. hieu va dai truc van ((anh va) or (hanh va)) cua tre*.