Perhaps you should try some spelling variations:
sach tham » sach nha
cac vung » cac chung, cach dung, cac tuong
van hanh » van thanh, ban hanh, van anh
nang cho » nang chon, ngang cho, nang cao
sach thu » sach thue, sach thieu, cach thuc
cac ung » cac chung, cac cong, cac dang
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
cua cay » cua cac
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: te ((sach thu) or (sach tham)) nang cho hoc. hieu ve ((cac vung) OR (cac ung)) van hanh vi cua cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach tham)) nang cho hoc. hieu ve ((cac vung) OR (cac ung)) van hanh vi cua cay*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) or (sach tham)) nang cho hoc. hieu ve ((cac vung) OR (cac ung)) van hanh vi cua cay*".