Perhaps you should try some spelling variations:
thanh vinh » thanh binh, thanh tinh, than kinh
tan thanh » tran thanh, tang thanh, toan thanh
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, hieu ve
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
bac dac » bac dai, ban dac, bac dan
dac tan » duc tan, dac san, dai tan
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

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 dang xa hoi. ((hieu van) or (lieu va)) bac dac tan thanh vinh ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. ((hieu van) OR (lieu va)) bac dac tan thanh vinh ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. ((hieu van) or (lieu va)) bac dac tan thanh vinh ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. ((hieu van) or (lieu va)) bac dac tan thanh vinh ((cuu tre) OR (cua tre))*.