Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van cam » van nam, van lam, van cau
duc ban » duc tan, duc van, dua ban
cua tre » cuu tre, cua triet, dua tren
nang xa » nang x, lang xa, nang ma
cam duc » cam xuc, cao duc, pham duc
sac ky » cac ky
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: tu ((sai ky) or (sac ky)) nang xa hoi. hieu van cam duc ban hanh hai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sai ky) OR (sac ky)) nang xa hoi. hieu van cam duc ban hanh hai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sai ky) or (sac ky)) nang xa hoi. hieu van cam duc ban hanh hai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu ((sai ky) or (sac ky)) nang xa hoi. hieu van cam duc ban hanh hai ((cua tre) OR (cua te))*.