Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
hang tai » hang va, dung tai
van doan » van doanh, van toan, van hoan
cua tre » cua te, cuu tre, cua triet
ve nham » ve nha, ve cham
va doan » va doanh, va dan, va don
hieu ve » hieu va, hieu van
tai hoi » tai khoi, dai hoi, tai hai
sac ky » cac ky
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sai ky)) hang tai hoi. hieu ve nham thuc ((va doan) or (van doan)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) hang tai hoi. hieu ve nham thuc ((va doan) OR (van doan)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sai ky)) hang tai hoi. hieu ve nham thuc ((va doan) or (van doan)) vi cua tre*.