Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
van nhan » van phan, danh nhan, van khanh
ty lang » tay lang, ty hang, tu lang
va hang » van hang, va nang, va lang
hang vi » hang va, hanh vi, hang di
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di 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: toc sach ((ty lang) or (ty xang)) xa hoi. thi ((van nhan) OR (van thanh)) tuc va hang vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty lang) OR (ty xang)) xa hoi. thi ((van nhan) OR (van thanh)) tuc va hang vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty lang) or (ty xang)) xa hoi. thi ((van nhan) OR (van thanh)) tuc va hang vi cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty lang) or (ty xang)) xa hoi. thi ((van nhan) OR (van thanh)) tuc va hang vi cua te*.