Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
hanh hai » thanh hai, nhanh hai, hang hai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
le nam » ly nam, he nam
te nam » tu nam, he nam, tw nam
hai va » hai van, thai va, hoi va
le na » le va, le ta, le ha

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 ky nang xa hoi. hieu ((((le nam) OR (te nam))) or (le na)) thuc vat hanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((((le nam) OR (te nam))) OR (le na)) thuc vat hanh hai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((((le nam) OR (te nam))) or (le na)) thuc vat hanh hai va triet*".