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
nam xua » nam cua, nam mua, nam qua
va dinh » van dinh, va kinh, va tinh
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cuu tre, cua triet, dua tren
xua va » xuat va, vua va, sua va
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: te ((thai ky) or (hoi ky)) nang xa hoi. hieu van nam xua va dinh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((thai ky) OR (hoi ky)) nang xa hoi. hieu van nam xua va dinh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: te ((thai ky) or (hoi ky)) nang xa hoi. hieu van nam xua va dinh vi ((cua tre) or (cua te))*.