Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, xuc ban
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang ma hoi. hieu ((ve cam) OR (va cam)) xuc van hanh di cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) nang ma hoi. hieu ((ve cam) or (va cam)) xuc van hanh di cua vat~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) nang ma hoi. hieu ((ve cam) or (va cam)) xuc van hanh di cua vat*.