Perhaps you should try some spelling variations:
thien van » thi van
ban hanh » ban hang
toc sach » hoc sach, doc sach, thuoc sach
cac vung » cac ung, cac chung, cach dung
nang hoa » nang hoat, hang hoa, nang hoc
cac vuc » cac nuoc, cac cuoc, cac quoc
tu nang » tru nang, tu nong, tu nano
cua cau » cua cac, cua chu, cua cay
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) OR (toc sach)) tu nang hoa hoc. thien van ((cac vuc) or (cac vung)) ban hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tu nang hoa hoc. thien van ((cac vuc) OR (cac vung)) ban hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) tu nang hoa hoc. thien van ((cac vuc) or (cac vung)) ban hanh vi cua cau*".