Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach ty » sach y, sach tu, sach thu
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
te sach » toc sach
nang xa » lang xa, mang xa, ang xa
nang ma » tang ma, sang ma, nang cao
va dam » van dam, va dao, va dau
dam tu » nam tu, cam tu, tam tu
di cau » da cau, diem cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((((nang xa) OR (nang ma))) or (nang x)) hoi. hieu va dam tu va hanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((((nang xa) OR (nang ma))) OR (nang x)) hoi. hieu va dam tu va hanh di cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((((nang xa) OR (nang ma))) or (nang x)) hoi. hieu va dam tu va hanh di cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((((nang xa) OR (nang ma))) or (nang x)) hoi. hieu va dam tu va hanh di cau tren*.