Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
chua tre » chua tri, cua tre, chua trieu
va chua » vua chua, ca chua, va chu
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
bac can » ban can, bat can, tac can
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
can va » can van, canh va, ban va

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

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