Perhaps you should try some spelling variations:
cong hai » cong thai, cong ha, hoang hai
quoc ban » quoc bao, quoc lan, quoc quan
te sach » toc sach
anh dai » vanh dai, anh bai, anh dat
duc ban » duc tan, duc van, dua ban
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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 ((y nang) or (v nang)) cong hai. hieu va cam ((quoc ban) or (duc ban)) anh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (v nang)) cong hai. hieu va cam ((quoc ban) OR (duc ban)) anh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) cong hai. hieu va cam ((quoc ban) or (duc ban)) anh dai cua tre*.