Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
su triet » su viet, su tien, ve triet
thu nang » thi nang, thu bang, tho nang
xa thanh » va thanh, ha thanh, ta thanh
thu hang » thi hang, thuc hanh, thu huong
va chat » van chat, va phat, cao chat
tu sach » thu sach, su sach, te sach
ve chat » van chat
dai su » dai sua, dai so, dan su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((thu nang) or (thu hang)) xa hoi. hieu ((ve chat) OR (va chat)) tuc xa thanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu nang) OR (thu hang)) xa hoi. hieu ((ve chat) OR (va chat)) tuc xa thanh dai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thu nang) or (thu hang)) xa hoi. hieu ((ve chat) OR (va chat)) tuc xa thanh dai su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thu nang) or (thu hang)) xa hoi. hieu ((ve chat) OR (va chat)) tuc xa thanh dai su triet*.