Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cva chua » ca chua, cha chua, cua chua
va thanh » gia thanh, ban thanh, va tinh
va chua » vua chua, ca chua, va chu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, chat xuc, cac cuoc
nang ma » tang ma, sang ma, nang cao

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 ky nang ma hoa. hieu vien ((cac xuc) OR (cac nuoc)) va thanh ((va chua) or (cva chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoa. hieu vien ((cac xuc) OR (cac nuoc)) va thanh ((va chua) OR (cva chua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoa. hieu vien ((cac xuc) OR (cac nuoc)) va thanh ((va chua) or (cva chua)) tre*".