Perhaps you should try some spelling variations:
bang dieu » dang dieu, sang dieu, bang kieu
dieu cua » dieu tra
xa bang » va bang, ba bang, ra bang
vien da » vien dai
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
tac xa » tuc xa, tac da
hien » bien, tien, dien

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 ((nang ma) OR (tang ma)) hoi. hieu ((vien da) or (hien dai)) tac xa bang dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ma) OR (tang ma)) hoi. hieu ((vien da) OR (hien dai)) tac xa bang dieu cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang ma) OR (tang ma)) hoi. hieu ((vien da) or (hien dai)) tac xa bang dieu cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang ma) OR (tang ma)) hoi. hieu ((vien da) or (hien dai)) tac xa bang dieu cua tre*.