Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
hien bac » mien bac, hien cac, tien bac
van dinh » van minh, van dich, va dinh
su sach » vu sach
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
vai cua » hai cua, lai cua, bai cua
bo van » vo van, so van, do van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ty nang xa hoi. bieu hien bac bo van dinh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang xa hoi. bieu hien bac bo van dinh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty nang xa hoi. bieu hien bac bo van dinh ((vai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty nang xa hoi. bieu hien bac bo van dinh ((vai cua) or (dai cua)) tre*.