Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, dai cua
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
sai ky » sac ky
ve cam » ve cham, ve cac, va cam
ha hoi » hoa hoi, ha noi, va hoi
su sai » su tai, su hai, su dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky dang ((ha hoi) or (xa hoi)). hieu ve cam duc van hanh ((thai cua) OR (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky dang ((ha hoi) OR (xa hoi)). hieu ve cam duc van hanh ((thai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky dang ((ha hoi) or (xa hoi)). hieu ve cam duc van hanh ((thai cua) OR (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky dang ((ha hoi) or (xa hoi)). hieu ve cam duc van hanh ((thai cua) OR (tri cua)) tre*.