Perhaps you should try some spelling variations:
van thanh » ban thanh
van tuan » van quan, van ban, anh tuan
cam thuc » am thuc, nam thuc, cam thu
te sach » toc sach
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam
y lang » _ lang, tay lang, yen lang
o lang » hoa lang, hoi lang
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 ((y lang) or (o lang)) xa hoi. hieu ve cam thuc ((van thanh) OR (van tuan)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y lang) OR (o lang)) xa hoi. hieu ve cam thuc ((van thanh) OR (van tuan)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y lang) or (o lang)) xa hoi. hieu ve cam thuc ((van thanh) OR (van tuan)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((y lang) or (o lang)) xa hoi. hieu ve cam thuc ((van thanh) OR (van tuan)) vi cua te*.