Perhaps you should try some spelling variations:
sang dai » sang tai, lang dai, sang mai
danh hai » dang hai, lanh hai, manh hai
cua tre » cua te, cuu tre, cua triet
da duoc » tao duoc, hoa duoc
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu van
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky sang dai hoi. ((hieu ve) OR (hieu va)) ((da duoc) or (cam xuc)) va danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky sang dai hoi. ((hieu ve) OR (hieu va)) ((da duoc) OR (cam xuc)) va danh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky sang dai hoi. ((hieu ve) OR (hieu va)) ((da duoc) or (cam xuc)) va danh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky sang dai hoi. ((hieu ve) OR (hieu va)) ((da duoc) or (cam xuc)) va danh hai cua tre*.