Perhaps you should try some spelling variations:
van pham » san pham, van phan, van phat
hieu van » hieu va, thien van, lieu va
te sach » toc sach
va tinh » may tinh
tu sach » thu sach, su sach, tu cach
nang o » nang co, nang ho, nang ro
dat su » sat su
o hai » co hai, so hai, o lai
da su » dan su, va su, de su

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 (te sach)) ky nang o hai. hieu van pham duc va tinh ((da su) OR (dat su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang o hai. hieu van pham duc va tinh ((da su) OR (dat su)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang o hai. hieu van pham duc va tinh ((da su) OR (dat su)) triet*".