Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu viec » nhieu viec, sieu viet, hieu hien
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
cac duc » cac du, cao duc, cac dac
nang ma » tang ma, sang ma, nang cao
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
di cua » dai cua, doi cua, de cua
cua te » cua tu
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ma hoi. ((((hieu viec) or (hieu ve))) or (thieu nien)) cac duc van hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. ((((hieu viec) OR (hieu ve))) OR (thieu nien)) cac duc van hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. ((((hieu viec) or (hieu ve))) or (thieu nien)) cac duc van hanh di cua te*.