Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
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: ((((tu cach) or (tu cac))) or (toc sach)) ky lang xa hoi. hieu van cam duc va danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu cach) OR (tu cac))) OR (toc sach)) ky lang xa hoi. hieu van cam duc va danh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((((tu cach) or (tu cac))) or (toc sach)) ky lang xa hoi. hieu van cam duc va danh vi cau tren*.