Perhaps you should try some spelling variations:
sang dai » sang tai, lang dai, sang mai
phat duc » pham duc, phan duc, phan duoc
ky sang » ky nang, ky dang, ky tang
dai hoi » dai hoc, dai hai, dai moi
hieu su » hieu sau, tieu su, hieu so
su phat » su pham, tu phat, xu phat
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cai ky sang dai hoi. hieu su phat duc va danh vi cua tu~.
• Adding a wildcard symbol may retrieve word variants: tu cai ky sang dai hoi. hieu su phat duc va danh vi cua tu*.