Perhaps you should try some spelling variations:
cuu duoc » cuu dac, che duoc, co duoc
danh vai » danh sai, doanh van, dang van
hieu van » thien van, lieu va, hieu ve
sach so » mach so, sach lo, sach song
danh va » doanh va, hanh va, anh va
duoc va » nuoc va, duc va, duoc ma
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
so lang » o lang, so dang, hoa lang
cua tre » cua te, cuu tre, cua triet

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 so lang xa hoi. ((hieu van) or (hieu va)) cuu duoc va ((danh vai) OR (danh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach so lang xa hoi. ((hieu van) OR (hieu va)) cuu duoc va ((danh vai) OR (danh va)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach so lang xa hoi. ((hieu van) or (hieu va)) cuu duoc va ((danh vai) OR (danh va)) cua tre*".