Perhaps you should try some spelling variations:
nang son » nang song, nang soan, lang son
vanh dai » van dai, vanh tai, lanh dao
te sach » toc sach
son hai » cong hai
hieu va » lieu va, hieu qua
xuc ban » cuc ban, quoc ban, xuat ban
duc ban » duc tan, duc van, dua ban
anh dai » anh bai, anh dat, anh tai
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: te sach y nang son hai. hieu va cam ((xuc ban) or (duc ban)) ((anh dai) OR (vanh dai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang son hai. hieu va cam ((xuc ban) OR (duc ban)) ((anh dai) OR (vanh dai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang son hai. hieu va cam ((xuc ban) or (duc ban)) ((anh dai) OR (vanh dai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang son hai. hieu va cam ((xuc ban) or (duc ban)) ((anh dai) OR (vanh dai)) cua tre*.