Perhaps you should try some spelling variations:
cay mang » cach mang, cay mac, day manh
cay cong » cac cong, cao cong, cau cong
van hanh » van thanh, ban hanh, van anh
dat tren » dat trong, dua tren
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cau vuc » cau luc, cau truc, cau phuc
vuc van » duc van, luc van, thuc van
va cau » van cau, va cac, va dau
vi dat » voi dat, vi dai, va dat

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