Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
cac lop » cac hop, cac loai
cac loc » cac toc, cac hoc, cac nuoc
vu sach » vu bach, su sach, vu khach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang
ky danh » ky anh
di cua » dai cua, doi cua, de 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: vu sach ((ky danh) or (ky dang)) xay hoi. hieu vien ((cac loc) OR (cac lop)) va thanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky danh) OR (ky dang)) xay hoi. hieu vien ((cac loc) OR (cac lop)) va thanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ky danh) or (ky dang)) xay hoi. hieu vien ((cac loc) OR (cac lop)) va thanh di cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky danh) or (ky dang)) xay hoi. hieu vien ((cac loc) OR (cac lop)) va thanh di cua te*.