Perhaps you should try some spelling variations:
tang hanh » tang thanh, dang hanh, nang hanh
hieu vien » hieu hien, hieu viec, thieu nien
ky danh » ky anh, ky dang
danh xa » danh ca, dinh xa, canh xa
cac tac » cac toc, cac dac, cac tai
cac bac » cac bai, cac ban, cac cach
vai cua » dai cua, hai cua, lai cua
vi cua » di cua
tich » tinh, dich

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

• Performing a fuzzy search may retrieve terms with similar spellings: tich va ky danh xa hoi. hieu vien ((cac tac) or (cac bac)) tang hanh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tich va ky danh xa hoi. hieu vien ((cac tac) OR (cac bac)) tang hanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tich va ky danh xa hoi. hieu vien ((cac tac) or (cac bac)) tang hanh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tich va ky danh xa hoi. hieu vien ((cac tac) or (cac bac)) tang hanh ((vi cua) OR (vai cua)) tre*.