Perhaps you should try some spelling variations:
xa truong » cac truong
toc sach » hoc sach, doc sach, thuoc sach
va tuong » va thong, va phuong, tu tuong
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
sach 2 » sach y
ma hoi » mai hoi, xa hoi, ma hoa
2 nang » v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach 2 nang ma hoi. hieu va cac tu ((((va tuong) OR (xa truong))) or (va thuong)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach 2 nang ma hoi. hieu va cac tu ((((va tuong) OR (xa truong))) OR (va thuong)) doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach 2 nang ma hoi. hieu va cac tu ((((va tuong) OR (xa truong))) or (va thuong)) doi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach 2 nang ma hoi. hieu va cac tu ((((va tuong) OR (xa truong))) or (va thuong)) doi cua tre*.