Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
van chat » cao chat
chat soc » cham soc, chat hoc, chat doc
tai lang » tai cong, thi lan, tai san
tay lang » tay tang, tay quang, tham lang
va hanh » van hanh, va danh, ban hanh
te sach » toc sach
ve cau » ke cau, va cau, ve cac

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 ((tay lang) OR (tai lang)) xa hoi. hieu van chat soc ((va hanh) or (va thanh)) ve cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tay lang) OR (tai lang)) xa hoi. hieu van chat soc ((va hanh) OR (va thanh)) ve cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tay lang) OR (tai lang)) xa hoi. hieu van chat soc ((va hanh) or (va thanh)) ve cau theo".
• Adding a wildcard symbol may retrieve word variants: te sach ((tay lang) OR (tai lang)) xa hoi. hieu van chat soc ((va hanh) or (va thanh)) ve cau theo*.