Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
xay hoi » xa hoi, tay hoi, cay phoi
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
nam duc » nam duoc, pham duc, nam thuc
tu dang » thu dang, su dang, vu dang
di cua » dai cua, doi cua, de cua
cua te » cua tu

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) or (toc sach)) ((tu dang) OR (tu dong)) xay hoi. thien van nam duc va hang di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((tu dang) OR (tu dong)) xay hoi. thien van nam duc va hang di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ((tu dang) OR (tu dong)) xay hoi. thien van nam duc va hang di cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((tu dang) OR (tu dong)) xay hoi. thien van nam duc va hang di cua te*.