Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham
soc van » hoc van, oc van, sac van
vi cau » va cau, ve cau, di cau

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((((nang ma) OR (dang xay))) OR (nang x)) hoi. lieu va cham soc van hanh vi cau tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((((nang ma) OR (dang xay))) OR (nang x)) hoi. lieu va cham soc van hanh vi cau tren*.