Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
te sach » toc sach
cao hoc » co hoc, chat hoc
cho hoc » co hoc, khoa hoc
hieu ve » hieu va, hieu van
cac ung » cac chung, cac cong, cac dang
ung van » dung van, vung van, cung van
hai cua » thai cua, dai cua, hoi cua
cua cau » cua cac, cua chu, cua cay
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: te sach thue nang ((cao hoc) or (cho hoc)). hieu ve cac ung van hanh hai cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thue nang ((cao hoc) OR (cho hoc)). hieu ve cac ung van hanh hai cua cau*.