Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac
nang cho » nang chon, ngang cho, nang cao
van hanh » van thanh, ban hanh, van anh
tu nang » tru nang, tu nong, tu nano
cho hoc » co hoc, khoa hoc
hoc anh » hoc nganh, hoc nhanh, ngoc anh
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
luc van » luoc van, luu van, duc van
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: ((hoc sach) OR (hoc anh)) tu nang cho hoc. hieu ((van cac) or (van bac)) luc van hanh di cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc anh)) tu nang cho hoc. hieu ((van cac) OR (van bac)) luc van hanh di cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc anh)) tu nang cho hoc. hieu ((van cac) or (van bac)) luc van hanh di cua cay*".