Perhaps you should try some spelling variations:
cong hai » cong thai, cong ha, hoang hai
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cam cuc » cam xuc, cham cuu, pham cuc
cuc ban » cua ban, cac ban, cuu ban
ban anh » ban hanh, ban banh, ban danh
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang ((son hai) or (cong hai)). hieu va cam cuc ban anh ((di cua) OR (de cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((son hai) OR (cong hai)). hieu va cam cuc ban anh ((di cua) OR (de cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((son hai) or (cong hai)). hieu va cam cuc ban anh ((di cua) OR (de cua)) triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((son hai) or (cong hai)). hieu va cam cuc ban anh ((di cua) OR (de cua)) triet*.