Perhaps you should try some spelling variations:
hoc cac » hoc cao
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
hieu ve » hieu van
cuu tre » cua tre, cau tren, cau treo
hoa hoi » khoa hoi, hoa hoc, hoa doi
ha hoi » ha noi, xa hoi, va hoi
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc cac ky dang ((ha hoi) or (hoa hoi)). ((hieu ve) or (hieu va)) cam xuc va dan di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc cac ky dang ((ha hoi) OR (hoa hoi)). ((hieu ve) OR (hieu va)) cam xuc va dan di cuu tre.
• Adding a wildcard symbol may retrieve word variants: hoc cac ky dang ((ha hoi) or (hoa hoi)). ((hieu ve) or (hieu va)) cam xuc va dan di cuu tre*.