Perhaps you should try some spelling variations:
hieu su » hieu sau, tieu su, hieu so
tu sach » thu sach, su sach, te sach
ky sang » ky nang, ky dang, ky tang
dai hoi » dai hoc, dai moi
va hanh » van hanh, va thanh, va danh
su chao » su cao, sau chan
dai hai » dai han, dai tai, dai thao
tu sac » tu cac, tu san, tu bac
vi cua » vai cua, di cua
cua te » cua tu
xu va » xu van, tu va, su va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky sang ((dai hoi) OR (dai hai)). hieu su chao xu va hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu sach)) ky sang ((dai hoi) OR (dai hai)). hieu su chao xu va hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu sach)) ky sang ((dai hoi) OR (dai hai)). hieu su chao xu va hanh vi cua te*.