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

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 nano cau hoi. hieu ((ve cam) or (ve cham)) 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 nano cau hoi. hieu ((ve cam) OR (ve cham)) xuc van hanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su sach tao nano cau hoi. hieu ((ve cam) or (ve cham)) xuc van hanh vi ((cua tre) or (cau tren))*.