Perhaps you should try some spelling variations:
dai tren » dat tren, dau tren, dan tren
van hanh » van thanh, ban hanh, van anh
sach cay » sach cap, sach hay, sach nay
xuc van » duc van, luc van, vuc van
cau xuc » cam xuc, cau luc, cau truc
su sach » so sach, vu sach
mang xa » lang xa, dang xay, mang cua
hieu va » hieu qua
vi dai » si dai, li dai, vien dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach cay ((mang xa) or (mang may)) hoi. ((hieu va) or (lieu va)) cau xuc van hanh vi dai tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach cay ((mang xa) OR (mang may)) hoi. ((hieu va) OR (lieu va)) cau xuc van hanh vi dai tren.
• Adding a wildcard symbol may retrieve word variants: su sach cay ((mang xa) or (mang may)) hoi. ((hieu va) or (lieu va)) cau xuc van hanh vi dai tren*.