Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
hanh doi » thanh doi, hanh noi, hang doi
te sach » toc sach
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ly vang » ly hang, ly quang
cua tre » cua te, cuu tre, cua triet
ly van » le van, ly va, ly von

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 ((ly vang) OR (ly van)) xa hoi. hieu ve ((cham tuc) or (tham thuc)) va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly vang) OR (ly van)) xa hoi. hieu ve ((cham tuc) OR (tham thuc)) va hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ly vang) OR (ly van)) xa hoi. hieu ve ((cham tuc) or (tham thuc)) va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ly vang) OR (ly van)) xa hoi. hieu ve ((cham tuc) or (tham thuc)) va hanh doi cua tre*.