Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sac » toc sach, toc san, hoc sach
cam luc » cam xuc, cau luc
lai cua » dai cua, hai cua, lai chau
bai cua » ban cua, dai cua, bai ca
luc van » luoc van, luu van, duc van
hieu ve » hieu va, hieu van
mau hoi » mai hoi, mau ho, mau hop
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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: toc sac ky dang ((mau hoi) OR (cau hoi)). hieu ve cam luc van hanh ((bai cua) OR (lai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky dang ((mau hoi) OR (cau hoi)). hieu ve cam luc van hanh ((bai cua) or (lai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: toc sac ky dang ((mau hoi) OR (cau hoi)). hieu ve cam luc van hanh ((bai cua) or (lai cua)) tre*.