Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
cham tuc » nham thuc, tham thuc, cham soc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
vi cua » vai cua, di cua

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 ((y lang) OR (_ lang)) van hoa. hieu va ((cham tuc) or (pham thuc)) van thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y lang) OR (_ lang)) van hoa. hieu va ((cham tuc) OR (pham thuc)) van thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y lang) OR (_ lang)) van hoa. hieu va ((cham tuc) or (pham thuc)) van thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y lang) OR (_ lang)) van hoa. hieu va ((cham tuc) or (pham thuc)) van thanh vi cua tre*.