Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham xuc » cam xuc, chat xuc, cham soc
cac tren » ca tren, cau tren, tac tren
van hanh » van thanh, ban hanh, van anh
rac tren » ran tren, tac tren, sach tren
hieu ve » hieu van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
hanh va » hang va, hanh vi
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: thu sach ky nang o hoi. ((hieu ve) or (hieu va)) cham xuc van hanh va ((cac tren) or (rac tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang o hoi. ((hieu ve) OR (hieu va)) cham xuc van hanh va ((cac tren) OR (rac tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang o hoi. ((hieu ve) or (hieu va)) cham xuc van hanh va ((cac tren) or (rac tren))*.