Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
danh vai » danh sai, danh va, doanh van
cuu duoc » cuu dac, che duoc, co duoc
hieu van » thien van, lieu va, hieu ve
xay hoi » xa hoi, tay hoi, cay phoi
sach ty » sach y, sach tu, sach thu
sach ly » sach y, sach lo, sach hay
hieu va » lieu va, hieu qua
duoc va » nuoc va, duc va, duoc ma
va danh » va dinh, va dan, va hanh
vai su » va su, van su, lai 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 ly) or (sach ty)) dang xay hoi. ((hieu van) or (hieu va)) cuu duoc va danh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ly) OR (sach ty)) dang xay hoi. ((hieu van) OR (hieu va)) cuu duoc va danh vai su triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ly) or (sach ty)) dang xay hoi. ((hieu van) or (hieu va)) cuu duoc va danh vai su triet*.