Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
thien van » thi van
nang cau » nang cao, hang cau, nang dau
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
nano xa » nano va, nano bac, nano cau
nam cac » nam cao, nam sach
cac ban » cac dan, cac van, can ban
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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 truc ((nano xa) or (nang cau)) hoi. thien van nam cac ban hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach truc ((nano xa) OR (nang cau)) hoi. thien van nam cac ban hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach truc ((nano xa) or (nang cau)) hoi. thien van nam cac ban hanh vi ((cua tre) or (cua te))*.