Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
kho tang » cao tang
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
vu sach » vu bach, su sach, vu khach
ky tang » ky nang, ky dang, ky trong
ky sang » ky nang, ky dang, duy sang
mai hoi » mai khoi, dai hoi, lai hoi
ve cac » va cac, vien cac
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ky sang) or (((ky tang) or (kho tang)))) mai hoi. hieu ve cac xuc van hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky sang) OR (((ky tang) OR (kho tang)))) mai hoi. hieu ve cac xuc van hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky sang) or (((ky tang) or (kho tang)))) mai hoi. hieu ve cac xuc van hanh vi cau tren*.