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 dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
vi cua » vai cua, di cua
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 sang dai hoi. hieu su phat duc ((va danh) OR (va dinh)) vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky sang dai hoi. hieu su phat duc ((va danh) OR (va dinh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sai ky sang dai hoi. hieu su phat duc ((va danh) OR (va dinh)) vi cua te*.