Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cham xuc » cam xuc, chat xuc, cham soc
lang mai » lang dai, lang hai, lang man
tu sach » thu sach, su sach, tu cach
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
mai hoi » mai khoi, dai hoi, lai hoi
ty lang » tay lang, ty xang, ty hang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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) OR (te sach)) ty lang mai hoi. hieu vu cham xuc ((van hanh) or (ban hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty lang mai hoi. hieu vu cham xuc ((van hanh) OR (ban hanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ty lang mai hoi. hieu vu cham xuc ((van hanh) or (ban hanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ty lang mai hoi. hieu vu cham xuc ((van hanh) or (ban hanh)) vi cua tre*.