Perhaps you should try some spelling variations:
thien van » thi van
doc sach » hoc sach, toc sach, nuoc sach
tay lang » tai lang, tay tang, tay quang
nam duoc » nam thuoc, da duoc, dat duoc
ty lang » ty xang, ty hang, tu lang
duoc va » nuoc va, duc va, duoc ma
hang di » hang doi, hang dien, hang dich
hang vi » hang va, hanh vi, khang voi
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: doc sach ((ty lang) or (tay lang)) xa hoi. thien van nam duoc va ((hang di) OR (hang vi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((ty lang) OR (tay lang)) xa hoi. thien van nam duoc va ((hang di) OR (hang vi)) cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((ty lang) or (tay lang)) xa hoi. thien van nam duoc va ((hang di) OR (hang vi)) cua te*".