Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
cham cuu » cap cuu, chat cua
su sach » vu sach
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
cuu va » cuu van, cuu ve

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)) ty nang ma hoi. ((hieu va) OR (hieu qua)) cham cuu va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang ma hoi. ((hieu va) OR (hieu qua)) cham cuu va thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ty nang ma hoi. ((hieu va) OR (hieu qua)) cham cuu va thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ty nang ma hoi. ((hieu va) OR (hieu qua)) cham cuu va thanh vai cua tre*.