Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thai ky » thoi ky, than ky, thai ly
nang xa » nang x, lang xa, nang ma
dinh ve » dinh ket, dinh van
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va
ve cua » le cua, de cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((trai ky) OR (thai ky)) nang xa hoi. hieu van nam ((xuc va) or (duc va)) dinh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((trai ky) OR (thai ky)) nang xa hoi. hieu van nam ((xuc va) OR (duc va)) dinh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((trai ky) OR (thai ky)) nang xa hoi. hieu van nam ((xuc va) or (duc va)) dinh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((trai ky) OR (thai ky)) nang xa hoi. hieu van nam ((xuc va) or (duc va)) dinh ve cua tre*.