Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
cam thu » nam thu, cac thu, ca thu
te sach » toc sach
hieu va » lieu va, hieu qua
ty nang » ky nang, ty hang, ly nang
dam tu » nam tu, cam tu, tam tu
de dau » dem dau, de dao, de dat

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) or (ty xang)) xa hoi. hieu va ((cam thu) or (dam tu)) va hanh de dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ty xang)) xa hoi. hieu va ((cam thu) OR (dam tu)) va hanh de dau tren.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ty xang)) xa hoi. hieu va ((cam thu) or (dam tu)) va hanh de dau tren*.