Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
tai cua » thai cua, tai cuc, tri cua
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai 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 ((sach ky) or (sac ky)) tang ((ma hoi) OR (mai hoi)). hieu van cam tuc va thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) tang ((ma hoi) OR (mai hoi)). hieu van cam tuc va thanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) tang ((ma hoi) OR (mai hoi)). hieu van cam tuc va thanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) tang ((ma hoi) OR (mai hoi)). hieu van cam tuc va thanh tai cua te*.