Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
manh hanh » xanh hanh, danh thanh, minh thanh
hieu vien » hieu hien, thieu nien, hieu tieng
sach thu » sach thue, sach thieu, sach tham
hanh va » hang va, hanh vi
cac suc » cao suc, cac nuoc, cac cuoc
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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 ty) or (sach thu)) nang x hoi. ((hieu vien) OR (hieu viec)) cac suc manh hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) nang x hoi. ((hieu vien) OR (hieu viec)) cac suc manh hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach thu)) nang x hoi. ((hieu vien) OR (hieu viec)) cac suc manh hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach thu)) nang x hoi. ((hieu vien) OR (hieu viec)) cac suc manh hanh va cua tre*.