Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
cham duc » pham duc, cham soc, pham duy
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » hieu qua
va chua » vua chua, ca chua, va chu
va cua » via cua, ca cua, ma cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang mai hoi. ((hieu va) or (lieu va)) cham duc va thanh ((va cua) OR (va chua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang mai hoi. ((hieu va) OR (lieu va)) cham duc va thanh ((va cua) OR (va chua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang mai hoi. ((hieu va) or (lieu va)) cham duc va thanh ((va cua) OR (va chua)) te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang mai hoi. ((hieu va) or (lieu va)) cham duc va thanh ((va cua) OR (va chua)) te*.