Perhaps you should try some spelling variations:
te sach » toc sach
nang ma » tang ma, sang ma, mang may
hieu va » lieu va
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cam tu » cam thu, nam tu, dam tu
di cua » dai cua, doi cua, de cua
cua te » cua tu

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 y ((nang ma) OR (nang cao)) hoi. ((hieu va) or (hieu qua)) cam tu va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (nang cao)) hoi. ((hieu va) OR (hieu qua)) cam tu va hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang ma) OR (nang cao)) hoi. ((hieu va) or (hieu qua)) cam tu va hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) OR (nang cao)) hoi. ((hieu va) or (hieu qua)) cam tu va hanh di cua te*.