Perhaps you should try some spelling variations:
thanh mai » thanh hai, thanh tai, thanh moi
va triet » va thiet, va trien, ve triet
nang mai » nang ma, nang tai, lang mai
truc va » thuc va, thuc vat, trung va
su sach » vu sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
so sach » so sanh, bo sach, co sach
tuc va » thuc va, tuc xa, duc va
ve cam » ve cham, ve cac, va cam

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)) ky nang mai hoi. hieu ve cam ((tuc va) or (truc va)) thanh mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang mai hoi. hieu ve cam ((tuc va) OR (truc va)) thanh mai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky nang mai hoi. hieu ve cam ((tuc va) or (truc va)) thanh mai va triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky nang mai hoi. hieu ve cam ((tuc va) or (truc va)) thanh mai va triet*.