Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham xuc » cam xuc, chat xuc, cham soc
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
cuu tre » cua tre, cau treo
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu nang o hoi. hieu ve cham xuc ((van hanh) or (ban hanh)) lai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang o hoi. hieu ve cham xuc ((van hanh) OR (ban hanh)) lai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nang o hoi. hieu ve cham xuc ((van hanh) or (ban hanh)) lai ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang o hoi. hieu ve cham xuc ((van hanh) or (ban hanh)) lai ((cuu tre) OR (cau tren))*.