Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
chua tre » chua tri, cua tre, chua trieu
van hanh » van thanh, ban hanh, van anh
va chua » vua chua, ca chua, va chu
hanh va » hang va, hanh vi
can van » cac van, can ban, tan van
bac can » ban can, bat can, tac can
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky nang xa hoi. ((hieu vien) or (thieu nien)) bac can van hanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu vien) OR (thieu nien)) bac can van hanh va chua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. ((hieu vien) or (thieu nien)) bac can van hanh va chua tre*.