Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac
anh khoa » doanh khoa, hang khoa
khoa hoc » hoa hoc
hanh va » hang va, hanh vi
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
cua cay » cua cac
hieu ve » hieu va, hieu van
thi anh » thi hanh, thi thanh, thich anh
hoc anh » hoc nganh, hoc nhanh, ngoc anh
ve cac » va cac, vien cac

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)) thi anh khoa hoc. hieu ve cac vuc van ((anh va) or (hanh va)) cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc anh)) thi anh khoa hoc. hieu ve cac vuc van ((anh va) OR (hanh va)) cua cay*.