Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh dai » thanh tai, thanh dat, thanh oai
nam duoc » nam thuoc, da duoc, dat duoc
hieu van » hieu va, thien van, lieu va
duoc ha » duoc ma, duc ha, duoc va
sach ky » sach y, sach ty, sach kem
sac ky » cac ky, sai ky
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) nang x hoi. hieu van nam duoc ha ((thanh dai) OR (thanh hai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. hieu van nam duoc ha ((thanh dai) OR (thanh hai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang x hoi. hieu van nam duoc ha ((thanh dai) OR (thanh hai)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x hoi. hieu van nam duoc ha ((thanh dai) OR (thanh hai)) cua te*.