Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua tuc » cua duc, cua tu, cua thuoc
dau hai » dai hai, dau ha, cau hai
lam xuc » cam xuc, lam duoc
van lam » van nam
xuc va » duc va, tuc va, luc va
va dau » va dao
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
cua su » qua su
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach y) or (sac ky)) nang o hai. hieu van lam xuc va dau hai ((cua tuc) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach y) OR (sac ky)) nang o hai. hieu van lam xuc va dau hai ((cua tuc) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: te ((sach y) or (sac ky)) nang o hai. hieu van lam xuc va dau hai ((cua tuc) or (cua su))*.