Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
nang cho » nang chon, ngang cho, nang cao
ban hanh » ban hang
doc sach » hoc sach, nuoc sach, dac sac
tu nang » tru nang, tu nong, tu nano
cho hoc » co hoc, khoa hoc
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
duc ban » duc tan, duc van, dua ban
hanh di » hanh vi, hanh de, hang di
cua cay » cua cac
di cua » dai cua, doi cua, de cua

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) or (doc sach)) tu nang cho hoc. hieu ((van cac) or (van bac)) duc ban hanh di cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) tu nang cho hoc. hieu ((van cac) OR (van bac)) duc ban hanh di cua cay*.