Perhaps you should try some spelling variations:
nang son » nang song, nang soan, lang son
te sach » toc sach
sach ky » sac ky, sach y, sach ty
xanh di » danh di, vanh dai, xanh tai
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
xuc ban » cuc ban, quoc ban, xuat ban
hieu va » lieu va, hieu qua
son hai » cong hai
va cam » va cham, va cac, va cao
anh di » danh di, anh d, anh du

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 ky nang son hai. hieu va cam ((xuc ban) or (duc ban)) ((anh di) OR (xanh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang son hai. hieu va cam ((xuc ban) OR (duc ban)) ((anh di) OR (xanh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang son hai. hieu va cam ((xuc ban) or (duc ban)) ((anh di) OR (xanh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang son hai. hieu va cam ((xuc ban) or (duc ban)) ((anh di) OR (xanh di)) cua tre*.