Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cac cuoc » cac nuoc, ca cuoc, cac quoc
nang cho » nang chon, ngang cho, nang cao
cac vuc » cac nuoc, cac vung, cac quoc
hieu va » lieu va, hieu qua
sach ty » sach tu, sach thu, xach tay
cho hoc » co hoc, khoa hoc
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: toc ((sach ty) OR (sach y)) nang cho hoc. hieu va ((cac vuc) or (cac cuoc)) van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach y)) nang cho hoc. hieu va ((cac vuc) OR (cac cuoc)) van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach y)) nang cho hoc. hieu va ((cac vuc) or (cac cuoc)) van hanh vi cua cau*".