Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
va thanh » gia thanh, ban thanh, va tinh
hien cac » thien cac, vien cac, hieu cac
ky dang » ky nang, ky danh
cac tuc » cac toc, cac tu, cac tac
ky lang » ky nang, ky tang, tay lang
vai cua » dai cua, hai cua, lai cua
vu sach » vu bach, su sach, vu khach
tuc va » thuc va, truc va, tuc xa
vi cua » di cua

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 lang) OR (ky dang)) xa hoi. hieu hien cac tuc va thanh ((vi cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky lang) OR (ky dang)) xa hoi. hieu hien cac tuc va thanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ky lang) OR (ky dang)) xa hoi. hieu hien cac tuc va thanh ((vi cua) or (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky lang) OR (ky dang)) xa hoi. hieu hien cac tuc va thanh ((vi cua) or (vai cua)) triet*.