Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
ve cua » le cua, de cua, te cua

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 ty ((mang xa) or (nang x)) hoi. hieu va cam ((xuc va) OR (duc va)) thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((mang xa) OR (nang x)) hoi. hieu va cam ((xuc va) OR (duc va)) thanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((mang xa) or (nang x)) hoi. hieu va cam ((xuc va) OR (duc va)) thanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((mang xa) or (nang x)) hoi. hieu va cam ((xuc va) OR (duc va)) thanh ve cua tre*.