Perhaps you should try some spelling variations:
tinh hai » tinh thai, tinh chat, trinh han
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ma hoi. hieu ve pham duc va tinh hai ((cua tre) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu ve pham duc va tinh hai ((cua tre) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu ve pham duc va tinh hai ((cua tre) or (su tien))*.