Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
dai huu » dao huu, dai hau, dai thua
huu tre » huu tri, cuu tre, huu them
ma hoi » mai hoi, ma hoa, me hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((ma hoi) OR (xa hoi)). ((hieu van) OR (hieu va)) cac duc va thanh dai huu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang ((ma hoi) or (xa hoi)). ((hieu van) OR (hieu va)) cac duc va thanh dai huu tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((ma hoi) or (xa hoi)). ((hieu van) OR (hieu va)) cac duc va thanh dai huu tre*.