Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
nang cho » nang chon, ngang cho, nang cao
hoc sach » hoc sinh, hoc cac, hoc anh
ty nang » ky nang, ty xang, ty hang
cho hoc » co hoc, khoa hoc
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
duc van » duc va, duc tan, duc manh
van anh » van thanh, tuan anh, van minh
cua cay » cua cac
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di 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 (hoc sach)) ty nang cho hoc. hieu ((van cac) or (van hac)) duc van anh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ty nang cho hoc. hieu ((van cac) OR (van hac)) duc van anh vi cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ty nang cho hoc. hieu ((van cac) or (van hac)) duc van anh vi cua cay*".