Perhaps you should try some spelling variations:
hanh dong » anh dong, ha dong
hieu van » thien van, lieu va, hieu ve
dong cua » dung cua, cong cua, huong cua
va hanh » van hanh, va thanh, va danh
lao luc » bao luc
hieu va » lieu va, hieu qua
sach ly » sach y, sach lo, sach ty
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
ly vang » ly hang, ly van, ly quang
luc va » duc va, tuc va, loc va
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly vang ((ma hoi) or (mai hoi)). ((hieu van) OR (hieu va)) lao luc va hanh dong cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly vang ((ma hoi) OR (mai hoi)). ((hieu van) OR (hieu va)) lao luc va hanh dong cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly vang ((ma hoi) or (mai hoi)). ((hieu van) OR (hieu va)) lao luc va hanh dong cua te*".