Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
van hanh » van thanh, ban hanh, van anh
sach nay » sach hay, sach vay, sach nang
sach cay » sach cap, sach hay, sach vay
hanh va » hang va, hanh vi
xuc van » duc van, luc van, vuc van
cau xuc » cam xuc, cau luc, cau truc
hieu va » lieu va, hieu qua
mang xa » lang xa, dang xay, mang cua
va cau » van cau, va cac, va cao
va dau » va dao

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 cay) or (sach nay)) ((mang xa) or (mang may)) hoi. hieu va cau xuc van hanh va dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach cay) OR (sach nay)) ((mang xa) OR (mang may)) hoi. hieu va cau xuc van hanh va dau tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach cay) or (sach nay)) ((mang xa) or (mang may)) hoi. hieu va cau xuc van hanh va dau tren*.