Perhaps you should try some spelling variations:
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
cam tu » cam thu, nam tu, dam 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 ty nang xa hoi. ((hieu va) or (hieu qua)) cam tu va ((hanh di) OR (hang di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. ((hieu va) OR (hieu qua)) cam tu va ((hanh di) OR (hang di)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. ((hieu va) or (hieu qua)) cam tu va ((hanh di) OR (hang di)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. ((hieu va) or (hieu qua)) cam tu va ((hanh di) OR (hang di)) cuu tre*.