Perhaps you should try some spelling variations:
hang khoa » dung khoa
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
xang cho » sang cho, hang cho, tang cho
luc van » luoc van, luu van, duc van
cua cau » cua cac, cua chu, cua cay
sach tu » sach thu, cach tu, sach ty
ke cau » ket cau
vi cua » vai cua, di cua
ve cau » va cau, ve cac, le cau

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 tu ((xang cho) or (hang khoa)) hoc. hieu ((ve cau) OR (ke cau)) luc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu ((xang cho) OR (hang khoa)) hoc. hieu ((ve cau) OR (ke cau)) luc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu ((xang cho) or (hang khoa)) hoc. hieu ((ve cau) OR (ke cau)) luc van hanh vi cua cau*".