Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thu sach » tu sach, thuat sach, thuoc sach
hieu cac » hieu luc, hieu va, hieu van
cac chat » cao chat, cac thuat, cac nha
trang va » tran van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

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 xa hoi. hieu cac chat ((trang va) OR (hang va)) thanh dai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu cac chat ((trang va) OR (hang va)) thanh dai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu cac chat ((trang va) OR (hang va)) thanh dai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu cac chat ((trang va) OR (hang va)) thanh dai ((cua tre) or (cuu tre))*.