Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thai ky » than ky, thai ly, thao ky
thoi ky » hoi ky
nang xa » nang x, lang xa, nang ma
nam xuc » cam xuc, nam xua, nam thuc
va dinh » van dinh, va kinh, va tinh
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cuu tre, cua triet, dua tren
xuc va » duc va, tuc va, luc 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 (thoi ky)) nang xa hoi. hieu van nam xuc 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 (thoi ky)) nang xa hoi. hieu van nam xuc va dinh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((thai ky) OR (thoi ky)) nang xa hoi. hieu van nam xuc va dinh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te ((thai ky) OR (thoi ky)) nang xa hoi. hieu van nam xuc va dinh vi ((cua tre) or (cua te))*.