Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh tai, hanh van
su sach » so sach, vu sach
le tang » le quang, le trung, le thanh
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
sach le » cach le, sach de, sach lo
hanh va » hang va, hanh vi
ve cao » va cao, ve bao, ve cac
suc va » duc va, luc va, soc va
tuc va » thuc va, truc va, tuc xa
thiet » thieu

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 le tang xa hoi. hieu ve cao ((suc va) or (tuc va)) ((hanh vai) OR (hanh va)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach le tang xa hoi. hieu ve cao ((suc va) OR (tuc va)) ((hanh vai) OR (hanh va)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach le tang xa hoi. hieu ve cao ((suc va) or (tuc va)) ((hanh vai) OR (hanh va)) va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach le tang xa hoi. hieu ve cao ((suc va) or (tuc va)) ((hanh vai) OR (hanh va)) va thiet*.