Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tay lang » tai lang, tay tang, tay quang
dan bat » danh bat, dan dat, dan bac
hieu va » lieu va, hieu qua
te sach » toc sach
ty lang » ty xang, ty hang, tu lang
cac tac » cac toc, cac bac, cac dac
tac va » tac da, tac xa, tuc va
dan ba » dan bac, dan ca, dan va

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 ((ty lang) or (tay lang)) xa hoi. hieu va cac tac va ((dan bat) OR (dan ba)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty lang) OR (tay lang)) xa hoi. hieu va cac tac va ((dan bat) OR (dan ba)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty lang) or (tay lang)) xa hoi. hieu va cac tac va ((dan bat) OR (dan ba)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) or (tay lang)) xa hoi. hieu va cac tac va ((dan bat) OR (dan ba)) cua triet*.