Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
van hanh » van thanh, ban hanh, van anh
sach dao » lanh dao
nano cau » nang cau, bang cau, nano va
sach tao » sach bao, sach tai, sach tham
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach tao) or (sach dao)) nano cau hoi. hieu ve cam xuc van hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tao) OR (sach dao)) nano cau hoi. hieu ve cam xuc van hanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su ((sach tao) or (sach dao)) nano cau hoi. hieu ve cam xuc van hanh vi ((cua tre) or (cau tren))*.