Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
dan thanh » danh thanh, ban thanh, van thanh
thien van » thi van
cam thuc » am thuc, nam thuc, cam thu
so sach » bo sach, co sach, hoc sach
doi cua » dai cua, hoi cua
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
so sanh » do sanh
y lang » o lang, _ lang, tay lang
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (so sanh)) y lang xa hoi. thien van cam thuc ((dan thanh) OR (dang thanh)) doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) y lang xa hoi. thien van cam thuc ((dan thanh) OR (dang thanh)) doi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) y lang xa hoi. thien van cam thuc ((dan thanh) OR (dang thanh)) doi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) y lang xa hoi. thien van cam thuc ((dan thanh) OR (dang thanh)) doi cua tu*.