Perhaps you should try some spelling variations:
thanh mai » thanh hai, thanh moi, thanh oai
thanh tai » thanh hai, thanh toan, doanh tai
va triet » va thiet, va trien, ve triet
nang mai » nang ma, nang tai, lang mai
trung va » truong va, trang va, trung ha
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
tuc va » thuc va, truc va, tuc xa
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 ky nang mai hoi. hieu ve cam ((tuc va) or (trung va)) ((thanh mai) OR (thanh tai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang mai hoi. hieu ve cam ((tuc va) OR (trung va)) ((thanh mai) OR (thanh tai)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang mai hoi. hieu ve cam ((tuc va) or (trung va)) ((thanh mai) OR (thanh tai)) va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang mai hoi. hieu ve cam ((tuc va) or (trung va)) ((thanh mai) OR (thanh tai)) va triet*.