Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
hoc sach » hoc sinh, hoc cac, hoc anh
nang mai » nang ma, nang tai, lang mai
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang mai hoi. ((hieu va) OR (hieu qua)) cam luc van ((thanh vien) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang mai hoi. ((hieu va) OR (hieu qua)) cam luc van ((thanh vien) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang mai hoi. ((hieu va) OR (hieu qua)) cam luc van ((thanh vien) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang mai hoi. ((hieu va) OR (hieu qua)) cam luc van ((thanh vien) or (hanh vi)) cua tre*.