Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
cham hoi » cham voi, cham h'roi, pham hoai
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
sach 6 » sach y
nam lo » nam bo, nam so, nam co
sach 2 » sach y

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach 6) OR (sach 2)) tang ma hoi. hieu ve ((cham hoi) or (nam lo)) va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach 6) OR (sach 2)) tang ma hoi. hieu ve ((cham hoi) OR (nam lo)) va thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach 6) OR (sach 2)) tang ma hoi. hieu ve ((cham hoi) or (nam lo)) va thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach 6) OR (sach 2)) tang ma hoi. hieu ve ((cham hoi) or (nam lo)) va thanh vai cua tre*.