Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
nganh ky » nganh y, nganh xay, hanh ky
lang van » dang van, tang van, hoang van
va thanh » gia thanh, ban thanh, va tinh
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cuu tre, cua triet
dac va » duc va, day va, dat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((nganh ky) or (hanh kem)) lang van hoi. ((hieu ve) or (lieu va)) cac dac va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((nganh ky) OR (hanh kem)) lang van hoi. ((hieu ve) OR (lieu va)) cac dac va thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc ((nganh ky) or (hanh kem)) lang van hoi. ((hieu ve) or (lieu va)) cac dac va thanh dai cua tre*.