Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
tinh hai » tinh thai, tinh chat, trinh han
tinh lai » tinh lao, minh lai, tinh bai
hieu van » hieu va, thien van, lieu va
day may » dam may, dat may, dau may
tu sach » su sach, te sach, tu cach
bac day » bac dai, bac dan, bac thay
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) y nang xa hoi. hieu van bac day may ((tinh lai) or (tinh hai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu van bac day may ((tinh lai) OR (tinh hai)) cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang xa hoi. hieu van bac day may ((tinh lai) or (tinh hai)) cua triet*.