Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
xuc van » duc van, luc van, vuc van
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
so sach » so sanh, bo sach, hoc sach
lang ha » long ha
co sach » bo sach, cuon sach, hoc sach
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: ((so sach) OR (co sach)) ty ((nang x) or (lang ha)) hoi. hieu vu cham xuc van hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ty ((nang x) OR (lang ha)) hoi. hieu vu cham xuc van hanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) ty ((nang x) or (lang ha)) hoi. hieu vu cham xuc van hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) ty ((nang x) or (lang ha)) hoi. hieu vu cham xuc van hanh vi cau tren*.